Senior Slump Part 14: Pen

*It's alive!* Sorry about the long hiatus, yall. Reddit eating my last post kinda took the wind out of my sails, and I've had normal, non-kinky life stuff going on IRL, so this whole thing has taken a pretty far back seat. But I finally got around to finishing this chapter! Hopefully that will make it easy to keep writing, but no promises. But enough about that, on with the chapter! (And a little recap)

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[Link](https://www.reddit.com/r/BallbustingStories/comments/1cza40p/senior_slump_part_13_shoveling/) to last part so you can follow the links back if you aren't caught up.

So, since reddit decided to delete the last part, here's a synopsis of what was supposed to have happened, edited a bit, since as someone pointed out on my last post, Sam actually already had sex with Ms. Powell previously, so he was not a virgin:

* Sam goes out to shovel like his mom said
* his snowpants are old and loose
* he was feeling adventurous and excited after the morning's talk, so he decided to go commando
* they slipped when stretched, and his neighbor Mrs. Wilson got an eyefull
* Mrs. Willson is in her 60s, grey hair, widowed, fit, athletic build
* She exclaimed, sam was startled, he tripped and hit his head
* she rushed over, brushed his dick with her hands "accidentally" a couple times as she tried to help his get his pants up
* she told him he shouldn't be a stranger, she gets lonely, etc
* sam went inside and told his mom what happened
* she wasn't surprised by mrs wilsons reaction, had sam come sit
* she jerked him off, told him about how women have needs, and mrs wilson is a closet slut
* she squeezed his balls and showed him how to rub her pussy, and he came in her mouth
* then, she jumped on him and they fucked
* afterwords, Sam thought of penny, and suddenly felt kind of guilty. he realized that he had kind of been anticipating that night as the first time they would have sex, and by fucking his mom all of the sudden, he felt like he had betrayed her somehow.
* his mom noticed and figured out what he was thinking, also feeling guilty and noting that Penny had probably heard them
* she told sam to get cleaned up and stay in his room for a while
* chapter ended with sam feeling guilty and going up to his room

Anyway, on with the next part, for real this time!

Sam lay on his bed, staring at the ceiling, tapping a finger on his chest in nervous anticipation. It had been at least fifteen minutes since his Mom had gone to talk to Penny. What was happening? What was taking so long? Weight pressed down on his chest as he thought. Frustration welled up inside him and he exhaled an nervous sigh.

He didn't blame his Mom for what happened. He wasn't sure he even really blamed himself. It all made sense given the circumstances, but the timing had just been all wrong. The entire night he had been unconsciously building in the back of his head - the culmination of what had been building between him and is sister all semester, when everything was finally out in the open, when they could be together without worry or shame, the perfect end to the day - just tossed out the window by a single moment of unexpected passion.

He was sure Penny would be upset, hurt - she had to be. Sure, they hadn't made any formal plans, but he knew they had both been expecting the night to go that way. Throughout breakfast, by way of glances and moments of shared silence, they had come to an unspoken agreement - tonight would be the night, just the two of them, just as it had started. Now he didn't know what to expect, and not knowing was eating him up.

He got up and began to pace back and forth, contemplating going over to try to hear what was going on. Just as he had made up his mind to try it, he felt his phone vibrated in his pocket.

It was Penny. His heart skipped a beat as he unlocked his phone. It was a short message, saying only,

"Can you come to my room?"

He stood frozen for a moment, staring at the text, and cursing the ambiguity of written language. Was she angry? Sad? Eager? Was she going to tell him it had all been a mistake somehow?

\*Click\*

He locked his phone and faced to door.

"Fuck it. Only one way to find out." he whispered under his breath, and turned the doorknob.

Standing in front of his sister's door, he took a deep, steadying breath, and knocked twice.

"Come in." came the soft voice of Penny. Her tone was hard to read, emotional, yet calm, and a hint of something else he could not discern. He gently pushed open the door to find the room only dimly lit by her bedside lamp. Her curtain were drawn, and she was sitting on her bed, pillow clutched to her chest like a physical shield whatever she was feeling.

"Hey." Sam said gently, closing the door behind him.

"Hey.." she replied. Her expression was as hard to read as her tone had been as she contemplated him. He could see hurt, sadness, but also anger, anxiety, and... was it fear?

She sniffed and her expression darkened.

"Have a nice little fuck sesh? How was she? Better than Ms. Powell?"

"Uh, I-"

"I'm not stupid, Sam. We go to school together, you know. I was there early that day, too. I wat- I *knew* what was going on. It wasn't exactly hard to figure out you were fucking our teacher."

"Penny, look-"

"It's whatever." She said, deflated a bit and looking away. "I guess milfs are just your type or whatever."

Sam sighed and went to sit by his sister.

"I'm sorry, Pen. I didn't- I wasn't planning on that, today. It just kind of... happened. I thought she was just gonna, ya know, but then, it all happened so fast, and- not that I'm blaming her, but I just-"

"Whatever, it's fine, okay? I guess I shouldn't even really be surprised, now that we're all in this fucking love triangle thing, or whatever the fuck it is." Her short, irritated voice betrayed her. It was clearly, and decidedly, *not* fine.

"Penny... Do you.. not want to be?" he probed cautiously.

"I- No! I- ugh! I don't know, okay?!"

She buried her face in her pillow in frustration.

"This is all just so- so FUCKED. It wasn't supposed to be this way. None of it! Not Mom, not the stupid class, not- not us! Not like this."

"Oh..." Sam said, sudden worried. It was worse than he had expected. He knew she would be mad, but this... he didn't know what to say.

"I- uh, I see. Um..."

Noticing his reaction, Penny made a sound of exasperation and grabbed his hand.

"No, Sam, I don't mean it like *that!* I just mean, ugh, I don't know." she tried to explain.

"I thought you were okay with all this. After this morning, I thought-"

"I know. I was, I am. I think. I just- I didn't expect everything to happen so fast. I thought I'd have more time, we'd have more time to get used to it, and figure out, like, what *this* is exactly." She gestured between them.

"I know what you mean." he sighed, "This whole school year has honestly been insane. But look, regardless of anything else that's happened, I know one thing I have absolutely no regrets about." He turned to face his sister and cupped her cheek in his hand.

"You."

Penny responded with a small sound, somewhere between sadness and joy.

"I don't know how everything else is gonna work out, but the one thing I know for sure is that I love you. More than I should. More than I ever thought I'd admit to myself. I don't understand it, but I can't help it. It may have taken some weird, fucked up circumstances for me to figure it out, but I- heh, well I suppose you could say you've really kicked some sense into me recently."

Penny half laughed, half groaned.

"Idiot. That was so *lame*." she complained, despite the rosy cheeks suddenly tinting her cheeks, and the smile threatening to break across her lips.

"I won't deny that, hehe. But I'm your idiot, right?"

"Shut up." she replied, leaning into him with a kiss. After several moments, they broke apart, gazing into each other's eyes.

"I love you, bro."

"I love you too, Pen."

"But don't think just because I've forgiven you that your balls are getting off scot-free. I'm still pissed and they're a good punching bag."

"I knew that was too easy." Sam groaned.

"Shut up and drop those shorts." Penny commanded, smirking, her cheeks glowing with excitement.

Sam obeyed, pulling his loose boxer shorts off and standing in front of his sister with his legs spread. Penny knelt in front of him and weighed his bruised and swollen balls, tossing them up and down a few times. Sam hissed. In their damaged state, even Penny's softest touch caused his balls to twinge painfully.

"These suckers really can take a lot of abuse, huh?" Penny said, applying slight pressure.

"Fuuuck, please, Pen. They're so sore." Sam whined as she squeezed a littler harder.

"Hehe, yeah, that's kind of the point. You know, now that I think about it, I'm glad Mom's on board with this whole thing. It'll be so awesome to have someone there who knows exactly how much we can fuck up your balls without seriously injuring you."

She took one aching ball in each hand now and began to squeeze them, harder now. Sam gasped, his legs beginning to tremble. The pain was brutal. He gritted his teeth as she crushed his already bruised and inflamed testicles in her hands.

"We can crush your nuts and beat the shit out of them all day long, keeping you in constant pain for as long as we want, and bring you right to the edge of danger again and again." An excited, sadistic edge was creeping its way into Penny voice. An edge that both terrified and excited Sam.

Suddenly, she increased the strength of her grip to its full extent, the veins of her hands bulging, the skin turning white. Sam let out of hoarse cry as pain erupted inside him. Hie legs buckled and he fell to the floor, but Penny did not relent. Her crushing grip remained, compressing his tortured testicles without mercy.

Then, the pressure relented, and Sam gasped, shuddering in pain and relief. But the ordeal was not yet over. She pulled him roughly to his feet by the balls, and shoved him against her door. With one hand, she began to stroke his miraculously hard cock, the other, she placed on his shoulder.

"You're gonna cum for me this time, got it, big bro? You're gonna cum from your little sister smashing your *stupid*, *fat, nuts.*"

She punctuated each of those last three words with a sharp slam of her knee into his crotch.

*"Fuck, Penny! Fuck!"* Sam hissed through clenched teeth. Her hand worked his cock, her knee slammed his balls, and his head fell limply on her shoulder as she continued.

*SLAM. SLAM. SLAM. SLAM.*

It was too much. His mind going blank from the pain, he felt himself raise his head and shove his tongue into his little sisters mouth, kissing her passionately as the mixture of pain and pleasure overwhelmed him at last, and with a final, brutal, crushing impact of her knee into his destroyed balls, he came. He convulsed, his cock twitching wildly in Penny's hand as she fell to her knees, taking his cock into her mouth and sucking every last drop of cum out of him. When he was done, Sam fell to his knees, shuddering still.

Penny knelt beside him and put his head in her lap, caressing the side of his face.

"Shhh. You did so well for me, baby. Shh, shh. I know. I love you so much. I love that you can take this kind of pain from me. It's so sexy. You're the love of my life. I love you, Sam."

She leaned over him, and kissed his face, his lips, his cheeks, his head, everywhere she could reach from her position.

"Come to bed with me, Sam."

Slowly, gingerly, she helped him up and into her bed. She pulled off her clothes, and then climbed in beside him. Sam treasured feeling her naked skin against his own. It was the first time they had slept naked together, and despite the intense aching in his balls, he was filled with warmth and affection for her. They faced each other and kissed.

"I didn't go too hard did I?"

"I'll be fine. Like you said, they can take a lot."

"I know. I just- I got caught up in the moment a little bit. I don't actually want you to be in pain all the time. I only said that because I, I don't know. It was hot in the moment. But I want you to feel good, too. You know that, right? I want to make you feel as good as you make me feel. Better even. I wan-"

Sam stopped her with a gentle hand on her cheek.

"Pen, I know, okay? I know you wouldn't do anything I wasn't into. I won't deny that my balls hurt like hell, but you should know by now how I feel about that. Sometimes I wish it didn't, but fuck, getting my balls busted turns me on so much. Heh. Kind of embarrassing to say it out loud like that, but, yeah. I like it. I wand you to do it. So don't worry so much okay? I'll stop you if you go too far."

"Promise?"

"I promise."

Penny sighed and looked at him with love in her eyes.

"Why do you have to be so, so- fuck, I don't even know - so good. You're gonna make me insane with how obsessed with you I'm getting. It's actually kind of pissing me off." She said, her tone exasperated, but full of love and gentleness and admiration.

"Guess we're just made for each other." Sam said, smiling.

"I guess so."

They kissed again, and for a time after that, they simply lay together, cuddled in her too-small bed in her dimly lit room, in their little house, with heavy snow still blanketing onto the roof above them, breathing together, enjoying the simple pleasure, the cozy intimacy of rest together, until the gentle embrace of slumber finally took them, and they drifted off to sleep.