Bratty sister 8: A bath together, and a new punishment

Part 8 of the story, read the others first if you haven't. You can find them on my profile!

\*\*\*ALL CHARACTERS INVOLVED ARE AT LEAST 18 YEARS OLD\*\*\*

As I lowered myself into the tub, I let out a sigh of relief and sank into the warm water. I reached down and cupped my balls, still sore from the events at Aunt Jess's house. *It's a good thing I iced them as soon as I got home; they were pretty swollen after Nat was through with them.* Pleased that my still-sore balls were almost back to their normal size, I leaned back and rested my head on the bathroom wall. As I started to drift off, I must have lost track of time, because when I suddenly heard a knock on the bathroom door, I realized that Nat must have come home. She opened the bathroom door, wearing only a bath towel covering everything from her armpits to her upper thighs.

"You'd better not be playing with that big cock in here, mister!"

My freckle-faced little sister quickly moved to the edge of the tub and looked inside quicker than I could cover myself. Thankfully, as I had just been half asleep, I was completely soft. Despite always claiming that she busted me to keep my dick in check, Nat's frown revealed her disappointment in the limp dick staring back at her from under the water.

"Well, I know how you get if I leave you alone too long, so I'll just join you!"

With these words, Nat removed her towel, quickly using one hand to cover her modest breasts and the other to cover her crotch. She swiftly moved into the tub, sitting between my legs and facing away from me. 

"Nat!" I yelled, completely dumb-struck that my sister had so casually gotten into the bath with me. "What are you doing?!"

"Relax." She told me, leaning back and resting her body on my chest. "I've seen that big cock and those stupid balls a hundred times by now."

Despite her acting, this bratty young woman wasn't fooling anybody. I knew she was just trying to get me hard so she would have an excuse to bust my balls. I remembered the last time she'd gotten in the bath with me and remembered how she slipped and fell when she tried kicking my nuts. I steeled my resolve, diverting all my mental energy to keeping my dick soft. The petite brunette let out an annoyed sigh, unable to hide her disappointment that she had not yet achieved her goal of giving me an erection. She scooted back into me, pushing her soft ass into my crotch and causing my dick to start twitching. *Keep your cool, little dude! You gotta stay soft!* She leaned her head back, resting it on my shoulder as she let out an exaggerated, sensual moan.

"The water sure feels good!" she moaned, quickly darting her eyes south to see if her half-baked seduction techniques were doing the trick.

While Nat's attention was on her moaning and grinding into my crotch, my eyes were glued to her chest, which was now clearly visible. I stared at her modest breasts, rising and falling with each breath she took and each moan she made. I shifted my gaze between her bright pink nipples, and then down to her belly button. As my eyes desperately tried to see what lay beyond, she quickly got up onto her knees, turning to face me with one arm over her chest to cover her breasts. 

"Ew, you pervert!" She yelled. "Your hard cock was pressing into my back!" 

Despite her acting, she had a lust-filled smile on her face as she stared down at my hard dick. She moved forward, bringing her right knee up and gently resting it over my balls, trapping both of them between her knee and the floor of the tub. As she adjusted her position, my eyes remained glued to her naked body, causing my dick to throb. She giggled as she watched my erection bounce and twitch, then leaned into me, pressing her chest against mine and hugging her arms around my neck to balance herself. I felt her small breasts squish into my chest and could feel that her nipples had hardened. She rested her chin on my shoulder and whispered in my ear.

"Stay still. I'm gunna flatten these big, stupid balls! If you make me lose my balance, I'm *popping* them!"

With this, Nat leaned forward, shifting her weight to her right knee and pressing my balls into the floor of the tub. I tensed up, my hands wrapping around the petite brunette and resting on her hips as I snuggled my face into her neck. While concentrating on the sensation of her knee crushing my most sensitive place, I moved my hands up and down her lower back, feeling her soft skin and the curves of her hips and ass. She giggled as my hands made their rounds.

"Geez, that tickles! You're gunna make me fall!"

She lifted her free knee off of the floor of the tub, allowing all of her weight to bear down on my steadily-flattening balls. Despite the water in the tub and her arms around my neck taking much of the force off, the pain in my balls started increasing dramatically. I let out a moan and moved my hands from her back to her knee.

"Oh Nat, my balls... My baaaalllllls!"

She looked me in the face, my whimpers obviously making her excited. 

"That's right! I'm gunna *flatten* these stupid nuts! I won't have to worry about you stroking that hard cock if these big things don't work anymore!"

She started breathing heavily and refocused her efforts on her targets.

*Fuck, I'm close. That bitchy dirty talk is just too much for me!* As I felt myself nearing my climax, I panicked, knowing that once I came, she would get out of the tub and this would be over. Desperate for one last feel, I moved my hands down her back and grabbed her soft, bare ass. She let out an embarrassed squeal, quickly standing up and covering her breasts and crotch again.

"You pervert!" She yelled. "You're getting *punished* for that!"

Despite what she was saying, it was obvious from the look on her face that she had gotten exactly what she'd wanted. She stepped out of the tub, giving me a clear view of her well-shaped ass, and picked her towel up off of the ground. After she wrapped her towel around herself, she took my clothes from the side of the sink and carried them out the door.

"Nat, what are you doing with my clothes?"

She turned to look at me, brow furrowed, but unable to hide her devious smile.

"Naughty boys who grab their sister's ass need a punishment!"

As she left the room, I panicked. *What if we have a visitor?! I can't just walk around naked!* In my panic, I jumped out of the tub, drying the bottom of my feet on a floormat, and ran out the door, only to be stopped by a sudden, sharp pain exploding in my crotch.

\*Smack!\*

"Gotcha!" Nat yelled, giggling excitedly as her plan had worked flawlessly.

When she'd left the room, she'd hid around the corner, waiting for me to chase her so she could catch me off guard. As soon as she saw me, she launched her foot into my balls, crushing them against my pelvis. I bent over, holding my balls and breathing heavily as I tried to calm the pain. Nat threw my clothes behind her and stood in front of me, her hands on her hips and her body only covered by the towel.

"How'd your balls like *that*? Did it hurt? You weren't expecting that one!"

As she watched me groaning and holding my nuts, she started bouncing on her tippytoes, unable to contain her excitement anymore.

"Spread your legs! I wanna kick your balls!"

I looked up to see the petite woman bouncing up and down from the exciting prospect of busting my balls. In the midst of this bouncing, the top of her towel started to drop, revealing her hard, pink nipples. As I watched her small, exposed tits bounce up and down, my dick started throbbing. With my eyes glued to her chest, I moved my hands and spread my legs, clearing the way for Nat to do what she did best. She took a breath, calming herself down, before bringing her right leg back.

"You'd better pray I don't pop those big, stupid babymakers of yours!"

Nat sent her foot flying forward, crashing it into my balls and lifting me an inch off the ground as a slapping sound echoed throughout the room. She giggled as I fell to my knees, my hands desperately clutching my throbbing nuts.

"Hands off!" She yelled, kicking my hands away and once again exposing my sack. "This is a punishment! You're not allowed to protect them!"

She reached down and grabbed both of my hands, bringing them up and placing them behind my head.

"Keep your hands up there." She said, licking her lips as her eyes darted down to my completely defenseless dick and balls. "I'm *really* gunna fuck those balls up today!"

Nat delivered kick after devastating kick to my balls, smashing them up into my pelvis and causing me to cry out in pain each time. As my hands were clasped behind my head and I was on my knees with my legs spread apart, I was unable to do anything to protect my vulnerable nuts. With each subsequent kick, the burning, throbbing pain in my crotch steadily spread throughout my entire lower half. My eyes remained glued to my sister's chest, now completely exposed with the towel barely reaching her ribs. With each kick, the loud smack of her soft foot obliterating my naked balls was matched with the sight of her petite breasts bouncing up and down. After a dozen or so kicks, Nat started to breathe heavily, reaching her right hand under the bottom of her towel and touching her *own* crotch.

"Ooohhhh..."

She let out a sensual moan, and her body started to tremble. Watching the beautiful, nearly-naked woman pleasure herself after the cruel punishment she'd just delivered to my most sensitive area, I forced myself to stand. I walked up to her, placing my hands on her hips and leaning into her as the excruciating pain in my throbbing, swollen balls was almost too much for me to stand on my own. As she continued to rub herself, I leaned in and whispered in her ear.

"You're not done yet, are you? I thought you'd want more than that."

She let out a gasp at my words, rubbing herself more furiously as she listened intently.

"You're gunna bust my balls some more, right?" I asked, grabbing her free hand and moving it to my swollen ball sack. "I thought you said you were gunna *fuck my balls up*?

"Ohhhh.... Ahhhh!..."

She wrapped her right hand around my left nut and started squeezing. My body tensed and my hands grasped her hips.

"Oh fuck, Nat! My ball! You're crushing my ball!"

Nat's moaning and gasping became louder, and as she stared down my free nut, she removed her hand from her own crotch and reached for it, freezing between the two. Her eyes darted back and forth, as she was unable to decide between destroying my crotch and pleasuring her own. After a few seconds, I reached my right hand under her towel, gently rubbing her pussy before slowly entering her. She let out a surprised gasp, her blushing face looking up at me in surprise. 

"Do it." I told her. "I know you want to squeeze them."

As I slid my fingers further into her, my hand set into a rhythmic motion, and I could feel the wet, warm sensations of my sister's pussy as she frantically reached her now-free hand forward and grabbed my left nut.

"Ahhh!! Ohhhh!!!" She screamed, bucking her hips wildly and biting her lips. "Fuck! FUUCKK! Your balls! I'm gunna *destroy* your fucking *balls*!

She clamped down on my swollen balls with all her might, nearly causing me to drop to the floor. I moaned loudly from the pain, using all of my energy to remain standing and continuing to pleasure her with my hand. 

"Ohhh! AHHH! Wait! WAAIIT! AAAAHHHHHH!

All at once, her screaming, her moaning, and the bucking of her hips stopped. Her entire body tensed up, and as she continued to squeeze the life out of my throbbing balls, she buried her face in my chest. Her mouth stayed open, but no noise could be heard, and as I slowed the rhythmic movements of my fingers, her body slowly relaxed.

"Mmmmmmmmhhhh...."

She let out a long sigh as she fell into my body. She pushed herself off of me, stumbled over to the couch, and plopped down into a seated position. She let her head fall back into the couch and looked at me, her face completely red, her eyes crossed, and her mouth slightly agape. Taking a few seconds to breathe, she tried to speak.

"You... pervert..." She started, taking ragged breaths between words. "Touching... your sisters... pussy... like that..."

She let out another moan as she fell into a laying position, her towel nowhere near covering her petite breasts. Seeing her in this state and having not cum yet, my entire body trembled. *Jesus Christ, I have to fucking cum right now!* I started walking toward the staircase but was stopped by the sound of Nat's voice.

"You better not... be going up there... to stroke that cock..."

I looked back to see the dazed brunette forcing herself to stand, picking up her towel and placing it back over her breasts. As her eyes uncrossed and her hazy mind cleared, she looked at me with furrowed brows and pouting lips.

"I didn't know you'd... do something like that..."

Her voice trailed off, and as her face turned a deeper shade of red, her eyes darted around the room, as if she were trying to find the words she wanted to say.

"That cock really *is* dangerous." She said, looking down at my still-throbbing dick. "It gets so horny that you end up touching your sister's pussy like that... It's a good thing I'm here to keep it under control!"

*No, you dumbass, this is all BECAUSE of you! How the fuck don't you SEE that yet?!*

"I think it's time for some drastic measures!" She said, one hand leaving her towel and pointing at me as if condemning me of some terrible crime. "No more pants for you!"

*What?*

"What? What are you-"

"To make sure that cock isn't secretly getting hard," She interrupted, "You can't wear pants anymore. If you're naked, I can keep a better eye on that naughty cock!"

As I stared at my towel-clad sister, I was both amazed by the astounding stupidity of this whole conversation and excited at the prospect of always being exposed and at Nat's mercy. This new fantasy was too much for me in my already-horny state, and my dick started to throb so hard it was painful.

"Okay, okay," I agreed, desperate to go upstairs and relieve myself. "I'll keep my pants off, but I *really* need to-"

"No! Hands off that naughty cock!"

She walked up to me, reaching out with her right hand and slapping my hard dick in an overhand motion, causing it to bounce up and down. I let out a moan and grabbed her hips, causing her to shoot her knee up into my balls.

\*Crash!\*

With this final, devastating knee, I immediately hit my climax, and bucking my hips as hard as I could, I came. My first shot hit the top of her towel, with each subsequent one covering a lower and lower part of the cloth. With each shot, I let out a loud moan, intensely gripping her hips as I tried to stay upright. Nat remained frozen as she watched my twitching dick, her face turning red as she bit her bottom lip. As my orgasm faded, I backed up and slumped into the couch, completely drained of energy. A few seconds later, Nat came to her senses, her brows suddenly furrowing.

"Jeez!" she yelled. "This is what I mean!" She looked down at her now cum-covered towel. "Ew! Why does that stupid cock always have to cum *so much*?!"

She threw the towel at me, revealing her naked body for a split second before running toward the staircase. She stopped at the bottom, turning to me with her hands again covering both her chest and her crotch.

"I'm serious!" She yelled. "If I catch you trying to cover that cock, I'm gunna smash those balls *flat*!

With that, she ran up the stairs and out of sight, followed by the sound of her door slamming shut. I continued to sit on the couch for a few minutes, my vision blurry and my mind hazy. I laid down and took a deep breath, my entire body completely relaxed after the relief I'd just experienced. As I sat up, my hands reached down and grabbed my swollen, throbbing balls, rubbing them in an attempt to quell the intense pain radiating through them. I looked at the staircase and thought about what my sister had just said.

*No pants... Completely exposed all the time...* My heart started to race as I thought of the possibilities. As my mind wandered to fantasies of squeezes, kicks, knees, and God knows what else, my body started to tremble. *Oh God, I can't wait! What is my bratty little sister gunna do to me next?!*

*\*\*\**

Thanks for reading, let me know what you think!