Getting Treatment From Kat; Part 2

The following day, I found myself walking back to the athletic trainer's office to see Kat again, feeling incredibly nervous. Although I'm a little ashamed to admit it, I did end up masturbating when I got home the previous day, and I had experienced some discomfort down there while doing so. It was nothing crazy-- in retrospect, it was probably just general soreness from everything that had happened before. But Kat had specifically said that if I masturbated and experienced pain or discomfort, I should come back to follow up with her. I felt really nervous that there could be a more serious problem, and I figured it was better safe than sorry.

Kat's door was open, so I walked right into her office-- but I was surprised and confused to see another student in there with her. It was a girl I knew but not well; her name was Lily. We were in some classes together and had had some casual conversations; she was really cool, and I liked her, but I wouldn't say we were friends. She was super cute though, and I had toyed before with the idea of asking here out, but I never had. Whenever Kat was treating or consulting with a student, she kept her door closed, so I was confused to see Lily in there with her.

"Hey Colin!" Kat said as I walked in, smiling brightly. "What's up?"

"Oh, hi-- nothing," I said with uncertainty. "Sorry, I didn't realize you were seeing a student right now. I can come back later."

"Oh no, that's okay," Kat said. "Lily is actually here for credit. She's pre-med, and she's started interning with me a couple days a week."

"Hi Colin," Lily said with a small smile a little wave.

"Oh. Hi. I didn't realize. Cool." I was trying hard to process this information. I was stuck. I couldn't possibly talk to Kat with Lily there-- it would be way too embarrassing. It was already too embarrassing when it was just Kat. But I couldn't see a pretense on which I could back out now. And Kat wasn't about to provide one.

"Go ahead and shut the door," she said. "I assume you're here following up about yesterday, right?"

"Oh, um, well... yeah." I felt mortified.

"Okay great, well we'll double check that everything is okay." Kat was looking around for the chart she had started yesterday, and as she did so she addressed Lily about why I was here. "So Lily, yesterday Colin came in with a sports injury. As you might know, he's on the boy's lacrosse team, and during their game, after a wayward throw, the ball bounced off the ground and then struck him quite hard in the testicles."

"Okay," Lily said neutrally. She had a clipboard and was taking notes of her own. "I imagine there might be some irritation of the groin area where his athletic cup would have been pushed up into his pelvis?"

"Well, unfortunately, he wasn't wearing a cup," Kat said, glancing up quickly. "So the ball struck him flush in the scrotum."

"Oh," Lily said, looking up at me in surprise. "Okay."

"And of course, the thin fabric of his athletic shorts did nothing to absorb the blow, so the full force of the impact was directed straight into his testes," Kat said.

"Right." Lily nodded.

"So as you can imagine," Kat went on, "he wasn't feeling too great afterwards. They don't call it 'getting hit where it counts' for nothing." Lily nodded; I could tell that she was making an effort to maintain a professional demeanor.

Kat made some notes on her chart. "Well Colin, I think you and I were both hoping you wouldn't need to follow up on this injury. Why don't you tell us what brings you back in?"

I swallowed hard. I was almost dizzy with embarrassment.

"Well, um, you said, you know, if I, uh..." I trailed off.

Kat smiled at me sweetly. "It's okay Colin," she said. "Everything you tell me in here is protected by confidentiality. You don't have to be embarrassed about anything."

I took a deep breath. "Well, yeah, you said that, uh, if when I went home yesterday I, you know, um... ejaculated, and experienced discomfort, that I should come back, so."

"Okay, good," Kat said, writing as she spoke. "Was this a sexual encounter with someone else, or by yourself?"

"Um. By myself." Both Kat and Lily were taking notes. I felt extremely embarrassed.

"And did you use your hands, or something else?"

"I'm sorry?" I wasn't sure I heard her right.

"Well, some guys like to rub against something, like their bed, or use a sex toy, or a vibrator," she said. "I'm just asking how you did it."

"Uh. I used my hand," I said reluctantly.

"Okay, good," Kat said. "How long would you say it lasted for?"

If I had been drinking something I would have done a spit take. "Uh, I really don't know."

"Just estimate; it doesn't have to be exact," Kat said encouragingly.

"Um. I guess like six or seven minutes?" Kat and Lily were both taking copious notes, which for some reason felt particularly humiliating to me.

"Okay. And would you say that's a typical duration for you? Or do you usually last shorter or longer than that?"

"Uh, I guess that's typical," I said. I saw Lily steal a quick glance at me and then look back down at her clipboard. I could feel how red my face was. I wanted to somehow clarify, for Lily's sake, that I meant six minutes was a typical duration for jerking off, not for having sex; but there wasn't any reasonable way to do that.

"And did you experience pain the whole time, or only when you orgasmed?" Kat asked.

I shifted my weight; this was such an uncomfortable conversation to be having under any circumstances, let alone in front of these two women I was super attracted to. "Well, I guess sort of a low-level discomfort the whole time, and then a more pronounced pain at the end."

Kat nodded as she wrote down my responses. "Okay Colin, just a few more questions here. Until yesterday, had you ever, you know, been hit in the balls before?"

"Uh, yeah," I said, not feeling any more comfortable with the new line of questioning. "I had."

"Had any of those previous incidents been as bad, or as painful I should say, as the lacrosse ball yesterday?"

"Probably not," I said. "That was pretty bad."

"Okay," Kat said thoughtfully. "Can you think of an incident you'd identify as the second most painful experience you've had being hit there?"

I thought for a moment. "Well, yeah, I guess I can," I said sheepishly.

"Can you describe it to me?" Kat asked.

I swallowed with some effort. "Well, it was a few years ago, I was at the park with a group of friends, and this one girl who I didn't know that well-- I think she thought she was being playful, but she kicked me in the balls really hard. And she was wearing these really pointy shoes, and the point of them got my balls dead on--" I shuttered just remembering it. "It hurt really, really badly."

"I'll bet," Kat said. "And after that kick, did you experience any longer-term complications?"

"No," I said. "It hurt for a long time, but once I recovered, I pretty much felt back to normal."

"That's good," Kat said, making some final notes on her chart. "Okay, well, let's get straight to the examination." She and Lily both shifted in their seats so that they were facing me.

I looked around with uncertainty. "Isn't, um--"

Kat looked up at me. "Yes?"

I gestured at Lily. "Isn't, um, she going to leave?"

Kat looked at Lily as if she had just remembered she was there. "Oh, don't worry about that!" She said, a certain lightness in her voice. "Part of Lily's training is about getting hands-on experience with whatever walks through my door. Don't worry, she won't just be sitting there watching; she'll be helping me out. Just think of her as my assistant."

I didn't feel comfortable with that at all, but I didn't see how I could argue with her. I nodded reluctantly, feeling a cocktail of nerve-wracking emotions wash over me.

"All right Colin, why don't you come stand over here," Kat said, motioning me closer. Lily moved her chair over so that she was sitting right next to Kat, and I stood right in front of the two of them. Unceremoniously, Kat reached out, hooked her thumbs into the waistband of my gym shorts and my boxer-briefs, and slowly pulled both down to the floor in one motion. A new wave of embarrassment washed over me as my genitals were exposed not just to Kat-- who had obviously already become quite familiar with them the previous day-- but to Lily, a girl my own age who I had a bit of a crush on. Lily's eyes were locked below my waist, and I saw her eyebrows arch slightly as Kat pulled my shorts past my knees. I felt completely exposed and on display.

Kat lifted my shirt up so that it wasn't in the way, exposing my stomach and the bottom of my chest. "Can you hold this out of the way?" she asked me. I did as I was told, revealing even more of my body to the two women.

Both of their gazes were locked onto my unclothed crotch. Kat reached out and matter-of-factly took my balls in her hand, feeling around, a slight frown on her face. I took in a sharp breath at the feeling of her lithe fingers touching such a personal place. With her other hand, she lifted my penis out of the way so she could get a better look at my nads resting in her palm. Lily, right beside her, looked on intently.

"Well, everything feels normal to me, which is a good sign," Kat concluded, letting go of my parts to make a note on her clipboard. "But out of an abundance of caution, I think we should perform additional impact tests, like we did yesterday."

My stomach dropped like a rock; that was the last thing I wanted to hear. "Do we really have to?" I asked meekly.

"Well, as I said, in all likelihood everything is fine, and you're just experiencing routine soreness. But I'm just a bit concerned about the impact on sexual function, and I think it warrants the most thorough examination possible. After all, I would hate for this injury to affect your normal sexual functioning or your sex life."

I grimaced. As much as I hated the situation I was in, I couldn't disagree with that. "I guess so," I said.

"I'm sorry, I'm not sure I'm following," Lily spoke up. "What exactly does the more thorough examination entail?"

Kat turned to her and smiled. "Well, basically, we just want to verify that all of Colin's equipment is still responding to stimulus the way it should be. As I'm sure you know, Lily, the testicles are extremely sensitive, because they're located externally and they're deeply connected to the sympathetic nervous system. That's why, when you hit a boy's testicles, you initiate such a huge nervous system response, and cause him such agonizing pain."

"Right," Lily nodded.

"That kind of reaction is indicative of a healthy connection between the testicles and the rest of the body. So essentially, we're going to perform a series of impacts on Colin to make sure we're getting that nice healthy reaction, which will help verify that everything down there is working well."

Lily looked a little bit skeptical. "So you're saying... we're going to hit him in the balls?"

Kat smiled again. "Well, that's perhaps a slightly crass way to put it, but yes."

Lily's expression changed from skeptical something more complex; she looked surprised, mixed with something else I couldn't quite read. "Oh," she said. "Okay." There was a certain spark in the tone of her voice that I couldn't decipher.

"We already performed a similar evaluation yesterday," Kat explained. "Obviously, no guy would be thrilled about having that particular part of him hit over and over, but Colin is a real trooper about it." She winked at me, causing my heart to flutter, even through all the nerves.

"So we'll begin with a pretty basic impact, just to establish a baseline," Kat said, as both women redirected their attention back to my exposed private parts. "Lily, do you want to start? It will be some good experience with a diagnostic test that one doesn't get to perform that often."

My heart rate skyrocketed hearing Kat's words, but I was so far up this creek that the details hardly seemed to matter at this point.

"Oh, wow, um-- okay," Lily said. She sounded caught off guard. "Is there any particular, like, technique? Or should I just, um, kind of go for it?"

"We'll have more specific objectives as we move forward, but for now a pretty general strike will do," Kat said. "We just want to observe how he reacts to a normal impact."

"Okay," Lily said. "So I guess I'll just kind of, like... smack them?" She was clearly feeling quite hesitant.

"Yep," Kat said. The juxtaposition of confidence was evident. "No need to overthink it."

Lily brought her hand down so it was hovering between my legs, a few inches below my ballsack, and held it there for a moment. I could tell she was nervous-- probably not as nervous as me though. After a moment of hesitation, she quickly brought her hand up and slapped my balls with her palm.

"Ooph," I grunted, bending slightly at the waist. She hadn't hit very hard, but it still hurt, considering where it landed-- and the fact that I was naked from the waist down meant there was no chance for her aim to be anything less than perfect.

Kat smiled and shook her head. "You're going to have to hit them a lot harder than that, dear."

Lily's eyes widened. "Really?" She asked, her voice an odd mixture of timidity and excitement.

"Try it again," Kat said. "Maybe this time use the back of your hand, so that the impact lands with your knuckles."

Lily nodded, and with less hesitation this time, she lined up her aim and then delivered a firm backhand into my nuts. It was a harder hit than the first one, and just like Kat had said, she caught me with her knuckles, igniting a sharp pain in my nads.

"Ooo," I moaned, bending over and putting my hands on my knees.

"That's better," Kat said, "but still not quite enough." She smiled, with a slight gleam in her eye. "Have you ever hit a guy in the balls before, Lily?"

Lily blushed. "Oh-- well, um, yes. I guess a have. A few times."

"Okay, good," Kat said. "So I think you'll probably see where I'm coming from. Right now, you're hitting him like you're horsing around with one of your guy friends, and you give him a firm little sack tap, just for a good laugh. But I want you to hit him like he said something you thought was super annoying, and you *really* want to punish him for it. Like, you're not hitting him because it's a fun little joke to hit a guy's balls, you're hitting him because you want him to regret ever messing with you."

Lily looked a little unsure. "So you're saying I still need to hit harder?"

"Yes," Kat said emphatically. "Considerably harder."

Lily looked straight into my eyes with a strange expression on her face. "Won't that hurt him, like, a lot?" she asked Kat without breaking eye contact with me. My heart felt like it was beating in my throat.

"Well, yes," Kat said with a sweet smile. "But that's unfortunately an unavoidable part of this kind of testing. We all have to do unpleasant things when we go to the doctor sometimes; this isn't so different from that."

Lily shrugged. "Okay," she said. "Colin, can you spread your legs a bit more?"

Though it was the last thing I wanted to do, I dutifully obliged. Lily had a look of more intense concentration on her face as she eyed my package. She collected herself, cocked her arm, and then, with a partially closed fist, absolutely rammed her hand into my babymakers, a small grunt of effort escaping her mouth as her fist made solid, unobstructed contact with the most vulnerable part of me.

"Ooooooh," I cried out, considerably higher-pitched than before. "Oohh, fuck." I bent fully at the waist and then quickly sank all the way to the floor, my face contorted in pain. Her fist had landed super solidly and deeply. I was in agony.

"Fantastic!" Kat said in excitement. "That's what we're looking for. So as you can see, Lily, hitting his testicles that hard elicits an enormous nervous system response, just as it should. That's a good sign, and now we can move on to some more specific tests using that as a baseline response."

It took me a little bit before I could stand back up. When I did, Kat explained what was next.

"Now, not many people realize this, but the flat bottom part of the testicles is particularly sensitive, especially more towards the back of the scrotum; in real life it's hard to aim that precisely, but if you hit a boy in that very specific spot, it will hurt even more intensely than a regular shot to the testes. For example:"

Kat reached underneath and a little behind my legs, and then quickly slapped my balls with her fingertips, sort of pulling her hand back towards her from underneath them in one quick motion.

"Ahh!" I yelled in surprise, my knees buckling at the surprisingly sharp pain. "Ohhh," I groaned under my breath, my nads stinging.

"As you can see, that hurt him pretty badly, even though it wasn't especially hard," Kat said. "So we'll definitely want to test that that specific spot is properly sensitive."

I looked up. "That wasn't the test?" I said weakly.

Kat laughed. "No, sorry Colin; that was just a demonstration. I just needed to show Lily what I was talking about. But I'd like her to administer the actual test."

"Okay," Lily said. "Should I just, uh, go for it?"

"I suppose so," Kat said. "I'm a little skeptical you'll be able to aim precisely enough, but why don't you try."

Lily brought her hand where Kat had it, sort of beneath my butt, and then, trying to emulate Kat, she brought it forward in a quick motion, slapping the bottom part of my balls as she went by.

"Fuck!" I cried. "Ohh, God. Fuck." The pain in my nuts was red hot.

"Hmm, well, you clearly got him," Kat said with a frown. "But I'm not sure that was aimed quite precisely enough for the purposes of this test. Let's see if we can find something to aid us." Kat started looking around her office, which was always littered with equipment from the many different sports our school offered. She picked something up and walked back over. "Okay, let's try this," she said. In her hand was a riding crop, used by our school's equestrian team. I started to tremble a bit; a friend of mine had once hit me with one of those as a joke, and it hurt like *crazy*\-- and that was just in the arm. The idea of getting whipped in the sack with that thing was unimaginable; I felt terrified.

"This will help because you can aim it very precisely before you execute the impact," Kat said. "But to be clear, you've got to be really careful with this. This is an extremely power tool for inflicting pain; it's meant for a creature five times Colin's size, with a much tougher hide, and certainly not intended to be used on anything *near* as sensitive as a scrotum. We're going to use it because it will help us achieve the precise aim we need, but you have to make sure you don't do it too hard, because if you do, it will be *unthinkably* agonizing for Colin. I know that might seem a silly thing to say in the context of what we're doing here, but some things really are just too much."

"Okay," Lily said nodding confidently. "I understand." I was completely freaking out at what was to come, but I also felt a little relieved that Kat was at least drawing a line and standing up for me a bit.

Lily took the riding crop and pressed the leather end against my sack.

"Here, I'll help make sure you're aiming at the exact right spot," Kat said. She squatted down behind me, her face inches from my balls, to get the closest possible look at where the crop was aimed.

"A little to the left," she told Lily. "Okay, and a little further back. A *little* bit more. Okay! Perfect, right there. That's going to get him right in that ultra-sensitive spot."

Lily nodded, and then, concentrating hard on the exact spot Kat had helped her find, she brought the end of the crop down about a foot, held it there for a moment, and then whipped it into my balls.

"Eeeeeee!" I shrieked, immediately crumpling to the ground. "Ah ah ah, Ohhh my God, fuck fuck fuck." Lily had hit harder than I would have imagined based on the speech Kat had given. My balls felt completely annihilated.

"Excellent!" Kat said happily. "Great job, Lily. And you can see that Colin's testicles are indeed especially sensitive in that area, which is exactly what we wanted to see."

After a while I rose shakily to my feet. I expected that the embarrassment would have been subsumed by this point, yet somehow I still felt humiliated.

"Okay," Kat said when I was able to get back up. "Unfortunately, I think it's necessary in this case to do a pressure test."

"What's that?" Lily asked.

"That means that, instead of discrete impacts, we're going to apply constant pressure for a period of time and assess the effects of that," Kat explained. "I considered doing this yesterday, but I tried my best to avoid it, because it's going to be really, really unpleasant for Colin." She looked at me with an apologetic smile. I gulped. "But I don't think there's any getting around it here."

"What does that actually look like?" Lily asked. She seemed both cautious and intrigued at the same time.

"Well, basically, squeezing," Kat said. "I think I'll have you do this one too; you'll get some great experience from this."

Lily looked a little uncomfortable, but I couldn't help thinking she also looked excited. "Okay," she said.

"Go ahead and take his testicles in your hand," Kat said. "I've got to find a stopwatch."

Lily, who was sitting right in front of me, reached out and gently grasped my balls in her fingers, as Kat rummaged around for a timer. After so much unwanted attention to my jewels, her touch felt incredibly pleasurable. Her hand was smaller than Kat's, and her skin was incredibly soft on my sack. I became worried I would start to get hard, so I doubled down on thinking about how nervous and scared I was. Kat was taking a long time to find a stopwatch; her office was always a bit of a mess. Lily looked up at me and smiled awkwardly; we had been left in this odd position where she was just casually sitting with my babymakers in her hand.

Finally, after what felt like minutes, Kat pulled a stopwatch out of the bottom drawer in her desk. "Okay, sorry about that," she said. "I think 90 seconds should be sufficient. You ready to start squeezing?" Lily nodded. "Okay, go!" Kat said, starting the clock.

Lily tightened her grip on my sack, her fingers digging into my tender nuts. "Ughh," I said in discomfort. It was an incredibly unfamiliar and unpleasant sensation. I had taken my share fair of nutshots, mostly from friends of mine messing around, but never in the course of messing around does someone wrap their hand around your bare scrotum and squeeze. It felt like my whole world was being reduced to Lily's fingers tightening around my balls.

After 20 or 30 seconds, Kat called out to stop. Lily relaxed her grip, and I breathed a sigh of relief.

"Lily, you're actually going to have to squeeze *much* harder than that," Kat said.

Lily's eyes widened in shock. "Really?" She asked, sounding amazed.

"Yes," Kat said. "Think of it like this: take hold of his balls, and then close your hand and try to make the tightest fist you can, as if they weren't there at all. You should exert almost the maximum amount of force you can for the full 90 seconds."

Lily looked straight into my face with that same strange expression as before; I'm sure in return she saw total terror from me. "Okay, but..." she said hesitantly. "Won't that, like, completely devastate him? I mean, I was once wrestling with my brother, and I snaked my hand up his shorts and squeezed his balls that hard, and he was, like, *utterly* destroyed. I couldn't believe how effective it was. And that was only for like 15 seconds."

Kat was nodding with an understanding look on her face. "Yes, as I said, this is going to be pretty unpleasant for Colin. But it's better to do the test and make sure everything is okay than to skip it so we can avoid some momentary discomfort."

"Okay," Lily said with a shrug. "I guess that makes sense." No one asked for my input, of course.

"All right, let me just reset the timer here," Kat said, "and then when I say go, start squeezing."

Lily, whose hand was still on my balls, gave them one quick pump and smiled apologetically.

"Okay, go!" Kat called out.

Lily clamped down incredibly hard; as soon as she closed her hand I gasped loudly and started squealing. That fist instant of her closing her hand sharply felt like I had been kicked really hard in the balls. But unlike being kicked, it didn't also end in that same moment. The agony kept coming and coming and coming. I couldn't believe how tight her grip was; she was compressing my nuts into an area they couldn't possibly fit in. I looked at her face in desperation. She was looking down, concentrating on my lower half, her face taut with the effort of squeezing so hard.

"Ooooo," I whimpered, my voice so high it was just a whisper. "Please please please please." Lily glanced up at me but ignored my plea. Her grip never wavered.

Just when I thought I would surely pass out if it went on for another moment, Kat called time and Lily immediately released me. I crumpled to a heap on the ground and clutched my balls.

"That's more like it," Kat said. "This way we can really see the effect it had on him."

They kept discussing my reaction, but the conversation drifted in and out of my consciousness. When I finally felt able to stand back up, I got woozily to my feet, and Kat smiled at me.

"You're doing great Colin," she said. "I think there's basically just one more thing to do." She cleared her throat. "This is a little awkward, but I'm going to need you to ejaculate."

I stared at her blankly. "What?"

"I need to observe how your body reacts to that kind of stimulus," she said. "I know you might find it a little embarrassing, but just think: you'll probably enjoy it more than the other kind of stimulus we've been observing you react to today," she said with a wink.

"Uh... okay." I still hadn't really processed what she was saying.

"Now, I wouldn't have a problem doing it myself if that were necessary," Kat went on. "It is a strictly diagnostic setting, after all. But considering she's here anyway, I think it would be more appropriate if Lily did it, since she's your peer. Assuming you're comfortable with that, Lily."

Lily looked up in surprise. "Oh. Uh, sure. I guess so."

I was completely at a loss for how to respond. "Um," I said.

"I know it's slightly awkward," Kat said. But let's just remember that this is a professional setting, and we're doing this for your own good, Colin."

"Uh, okay," I said.

"So, Lily, we don't have to be ceremonial about it," Kat said. "Just, you know-- take us away."

"Uh, well, he's not hard," Lily said awkwardly.

Kat chuckled. "You make a good point. Colin, why don't you tell Lily how you like to be touched sexually, so that she can get you going."

I looked back and forth between the two of them, my mouth hanging open.

"It's okay Colin," Kat said. "Don't forget, everything in here is protected by confidentiality."

"Um. Okay. Well," I said, feeling my face get as red as it's ever been. "I like to be touched lightly, like, um, with fingertips. And, um. Well. I like to have my balls touched."

Kat chuckled. "That's a bit ironic, considering the context," she said.

"Like this?" Lily asked, gently running her fingertips over my ballsack. I felt a jolt of electricity; so much down there today and been so painful, and now all the sudden something felt so, so good.

"Oh. Yes," I said, swallowing hard.

She continued to caress me, running her fingers lightly over my balls, up and down the insides of my thighs, over my lower torso-- something else I really liked; somehow she had known without me telling her-- using two hands at once, moving in opposite directions, touching two places at the same time, using varying amounts of pressure. She was amazing at this. Soon she started to tickle her fingertips across the head of my penis, which had quickly grown hard, and then trace her fingers ever so lightly along the underside of my shaft, barely touching my skin. A moan of pleasure escaped my mouth. I felt so embarrassed that Kat and Lily were hearing me make that sound, but it felt so good that I couldn't do anything about it.

She continued to work me over like this for a few minutes, working her fingers like magic, and I was as hard as I'd ever been in my life. Then she reached over to Kat's desk and took a squirt of moisturizing lotion in her palm. She spread it evenly over both her hands, and then took my cock in her now lubricated grasp-- I gasped loudly when she took me in her grip; it was such a firm, full, wet sensation after so much light, tickly teasing-- and started to expertly work her hand up and down my shaft, moving it in smooth, silky spirals from the head all the way down to the base. I was taken aback at how good she was at this; a lot of girls I had been with didn't really know what to do with a penis, which I actually found kind of endearing in my personal life. But this-- no one had ever pleasured me like this. I couldn't believe how good it felt. I stole a glance at Lily, who I could tell, despite every effort to approach this in a professional capacity, was also turned on.

She had worked up a good consistent rhythm, and after a bit she reached out with her other hand and started to stroke my balls with her fingers, caressing them in the opposite direction that she was rubbing my dick. That's what sent me over the edge.

"Oh my God, I-- I'm gonna--" I said hoarsely, struggling to get the words out.

Lily increased the pressure and speed of her hand on my cock, which slid silkily through her lubricated grasp, and also took a tighter grip on my ballsack, stroking it and gently tugging down on it in one motion. I felt an enormous orgasm building, getting closer and closer to the edge-- and then it burst. Lily aimed my dick away from her but kept stroking fast and hard as I shot rope after rope of cum onto the floor of Kat's office. It lasted an incredibly long time, my muscles contracting so forcefully that they ached, but finally I was spent and Lily, after a few more strokes to make sure she got every last drop, let go of me.

I stood bent over at the waste, my hands on my knees in a wide-legged stance, panting heavily, trying to catch my breath. I could hardly process what had just happened. Then, suddenly, I heard an incredibly loud slapping sound echoing off the concrete walls of Kat's office, and then, a fraction of a second later, I felt an earth-shattering agony in my balls.

I made a horrible choked gasping sound and collapsed to the floor. Kat had come up behind me with the riding crop, and, only a few seconds after I had finished coming, had used it to whip me in the balls incredibly hard-- much harder than Lily had earlier. The pain was beyond describing.

"Ahhhhhhhhh," I groaned in absolute misery from the fetal position. "Ohhhh oh oh oh no no no, God, Ohhh my God." I kicked my legs out desperately and huddled even closer in on myself, clutching my devastated balls in my hand. I glanced up at Lily, who was looking down at me, stunned.

"That was the final evaluation i needed to get," Kat explained matter-of-factly; weirdly her voice was especially lucid in my consciousness, floating above me in the room. "I figured it would be better not to warn him about it, because then he just would have been so scared with anticipation."

"Oh, okay," Lily said. "What exactly was the objective of that one?"

"Well, a boy's testicles are *extremely* sensitive right after he has an orgasm," Kat explained. "I mean, *way* more sensitive than normal, and that's saying something." She chuckled at this way of putting it. "So by getting him right after he came, I should be able to elicit an absolutely *gigantic* nervous system response, one that entails completely unthinkable, world-shattering anguish. Plus I aimed for that spot right at the bottom of his balls, and I also used the crop, both of which would compound the effect even more; although in this situation the incredible sensitivity of his balls right after coming would have had so much effect that those added measures are probably unnecessarily thorough. The big picture, though, is that, even though it's important to do all those other evaluations we did, in certain very specific instances, he could still demonstrate a proper physiological response to those kinds of impacts even if there was an underlying issue. So I think it's really crucial to be thorough, and do a test like this, which can really demonstrate conclusively that his testicles are healthy and properly linked to the sympathetic nervous system."

I heard all this with total clarity, even though I was experiencing more agony than I ever had in my life. My balls ached so deeply that I couldn't believe it. I was shocked that had happened-- especially after Kat had made such a point of warning how devastating the riding crop could be. That hadn't stopped her from using it to whip my ballsack *way* harder than she had let Lily do the same thing. And she knew that because I had just come moments before, it would hurt way, way worse-- in fact, that was the point. And she still whipped me that hard. My head was spinning.

"Now for this kind of diagnostic work," Kat was addressing Lily, the two of them standing casually above me as I rocked back and forth, groaning miserably. "The most important data point is of course the subject's experiential response. So Colin," she said a bit louder, addressing me. "It's probably fair to say that hurt, right?"

"Yes," I croaked out; I could barely speak. I heard one of them stifle a giggle; I wasn't sure who.

"Now, because of the way I set up the evaluation," Kat continued, "if everything is working right, that should have more than hurt. Hopefully, it was singularly, unbearably painful, something that felt so awful you couldn't even have imagined it was possible. Would you describe it like that?"

"Yes," I barely managed to whisper.

"That's great to hear," Kat said. "Your testicles *should* be so sensitive after an orgasm that you could be launched into an orbit of all-consuming pain by a well-placed strike to your scrotum. I'm confident that everything is working as it should down there. Like I said, I was pretty sure that would be the case when you came in, but it's always important to be thorough."

With a lot of effort, I lifted my head and looked up. Lily was nodding in agreement: it was important to be thorough. After a long, long time, I was able to get up. Lily helped me get my underwear and shorts back on, and I gingerly walked home, trying not to think about what it would be like to see her in class the next day.