Bratty sister 10: Bikini shopping, and a footjob

Part 10 of the story, read the others on my profile if you haven't!

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

Still hazy from a deep sleep, I sat up on the side of my bed. *She's not here to wake me.* I remembered the events of the previous day. I remembered my sister's handjob and kiss and remembered how embarrassed she'd seemed after. *I'm not too sure how to approach this.* Leaving my lower half exposed as per the new house rule, I made my way downstairs, expecting to see Nat in the kitchen but finding it empty.

"What a naughty boy. First thing in the morning and you've already got that cock out."

I turned to see my curvy Aunt Jess seated on our couch, her right leg crossed over her felt and a hand on her cheek as she stared down at my exposed package. She was wearing a tight-fitting T-shirt accentuating her massive breasts and skin-tight jeans hugging the curves of her hips and ass. As my dick immediately began to stiffen, she giggled and waved me over. Without responding, I walked up to her and sat next to her on the couch.

"Were you hoping your little sister was down here? Just going to casually walk up to her like that? I know I told you to relax and enjoy it, but just walking around with your dick out..."

"N-No..." I stammered, not taking my eyes off her chest. "It's Nat's new rule. She said she's gotta keep an eye on me all the time."

The busty milf stared at me for a second before giggling and leaning into my shoulder. As she laughed, she reached down with her right hand, wrapping it around my exposed balls with one fluid motion and applying a light squeezing pressure.

"Then you must be in heaven, you naughty boy!" 

As Jess increased the pressure on my balls, I moaned loudly, my head craning back slightly as I spread my legs for her. *Nat's not here; I don't have to pretend.* As she started increasing the pressure, my hand moved to my dick, slowly stroking its length as I concentrated on the ever-increasing pain my aunt was giving me. She giggled as she watched my hand move up and down my shaft, looking up at me with a devilish smirk.

"You're getting a bit full of yourself, mister." She said, letting go of my balls and standing up. "Stroking your cock in front of your aunt? Poor Natalie, having such a pervert as a brother."

She turned away and started walking to the kitchen, the sway in her hips purposely more exaggerated than normal. Not wanting the moment to stop, I quickly stood up, walking behind her and hugging her from behind. She let out a soft moan as my arms wrapped around her waist. Smirking, she turned over her shoulder to meet my eyes.

"You're *really* getting full of yourself."

She reached back with her right hand, gently and rhythmically slapping my balls. As I felt the mild pain from her slaps, I squirmed, unable to contain my excitement anymore. I started grinding my dick into her ass, the rough texture of her tight jeans sending waves of pleasure throughout my body. I reached up, groping her breasts as I let out a moan, and as I lost my last shred of self-control, I leaned in to whisper in her ear.

"Harder, Aunt Jess. Please... I can't take it anymore..."

The busty milf blushed slightly at my words, a sight that I wasn't sure I'd seen before. She looked away to hide her face, grabbing my hands and moving them to her hips.

"Alright, little boy... You asked for it."

With these words, Jess launched her foot back up between my legs, smashing the heel of her foot into the underside of my exposed balls, smashing them up into my pelvis and raising me up onto my toes. I let out a cry of both pain and pleasure as her foot connected with my most sensitive place, gripping her hips as hard as I could to maintain my upright position. As she retracted her foot, I slid down onto my knees, my hands still firmly grasping her hips as I gasped for air.

"Aunt... Aunt Jess... Oh fuck..."

She turned to me, a smug expression on her face as she put her hands on her hips and stared down at my pathetic form.

"How was that? Hard enough for you? Is that big cock still gonna work after this?"

She squatted down in front of me, gently slapping the head of my throbbing cock as my hands desperately clutched my aching balls.

"No... After everything this little guy's been through, I'd say you'll be just fine."

As I stared up at the beautiful, curvy older woman that had just battered my balls, I heard a door open. Both of us turned to see Nat walking out of the bathroom, wearing a loose-fitting tank top with a sports bra visible through the openings on the sides and her denim short shorts hugging her ass. She looked over to see the aftermath of Jess's devastating heel kick, giggling as she approached. 

"Glad to know someone's keeping an eye on his stupid cock while I'm not around!" She exclaimed, clearly amused by my intense pain. 

"You know me, Natalie. I'm an expert." Jess replied, winking. 

Nat turned to me, grabbing me by the elbow and forcing me to stand.

"Put some pants on, mister; we're all going swimsuit shopping. It's beach season, and we haven't gone once! There's no way my swimsuit from last year is gonna fit!"

*Guess she's too excited about this to remember what happened yesterday?*

"Come on now..." Jess interrupted, her eyes drifting down to Nat's modest chest. "I think last year's will fit just fine."

Nat turned to her, pouting at the teasing comment. "You don't know that!" As she responded, she shot her hand out, smacking my balls with a sharp backhand.

\*Smack!\*

"Ohh!"

I plopped down on the couch, nursing my throbbing balls as the two women went back and forth, the older one teasing and the younger one getting more and more flustered. *I wasn't even the one who said it!* My mind went back to the sensations of Jess's body and her devastating heel kick. *It's kinda nice when I don't have to hide that I like it.* I continued to watch the two banter back and forth, my eyes drifting south as I took in their curves. *Swimsuit shopping, huh?...* As I spaced out considering the endless possibilities, I was brought back to reality by the force of my shorts hitting my face, thrown from my impatient sister.

"Hurry up and cover that cock! If we wait too long, all the good ones will be sold out!"

The two women walked to the door as I hurriedly donned the shorts, snaking my erection down one pantleg and putting a hand in my pocket to hold it in place. I hurried to the door and followed the women as we walked down the sidewalk toward the shopping square. 

"It's been a long time since we've gone out shopping together!" Natalie exclaimed excitedly.

"It sure has." Jess responded. "Do you know what kind of swimsuit you're gonna get?"

"I'm gonna get whatever kind *you're* getting, Aunt Jess!"

"I don't know, sweetheart. I don't think you have the figure to pull something like that off..."

As the two continued to go back and forth, I concentrated on trying to tame my erection. Unable to stop thinking about what had just happened with Jess, my dick continued to throb. I tried my best to conceal it using my hand in my pocket, but it was probably obvious to anyone looking that something wasn't right. *Shit, did she really have to do something like that right before we go out shopping?* As my tormented mind tried in vain to calm my erection, I was brought back to reality by a sudden, sharp pain in my balls.

\*Slap!\*

I leaned over and groaned in pain after Nat had quickly reached over and smacked my balls. 

"We're here, numbnuts! You're in charge of carrying the bags, so you'd better not be spacing out in there!"

Jess giggled as she watched us. "What a lucky man you are, to have such a loving sister." She gave me a knowing smile, aware that Nat wouldn't understand her true meaning.

"You're damn right, Aunt Jess!" Nat responded proudly, puffing out her chest. "If I didn't keep his stupid cock in check, he'd spend all his time at home stroking it! He'd just keep cumming everywhere and never leave the house!"

The two giggled as they entered the store, and as I followed along, I tried my best to both hide my erection and hold my throbbing balls without being too obvious. We went straight to the swimsuit section, and the two women quickly went to work. As Jess moved to the bikini side, Nat excitedly followed. Knowing they would take a while, I gratefully sat on a chair near the changing rooms, closing my eyes and using all of my willpower to calm my still-hard dick. Just as I was starting to relax, I felt a hand on my shoulder, opening my eyes to see Jess and Nat staring at me, holding up their swimsuits.

"Here we are. What do you think of this one?" Jess asked, holding up a bright red bikini to her clothes, playfully swaying her hips back and forth as if she were modeling. 

Before I could answer, Nat jumped in front of the older woman, holding her own pale blue bikini.

"Yeah, check it out! We're gonna match! What do you think of this one?!"

My eyes shifted between the two, my thoughts racing at what the finished product would look like. *Beach day is gonna be the best day of my life!* I swallowed, trying to calm myself as I responded in the most natural-sounding voice I could muster.

"Y-yeah, I think they definitely look like... swimsuits..."

*God damnit.*

Nat burst out laughing at my response, my embarrassment obvious as I turned my gaze to the floor.

"Alright, Natalie, that's enough teasing your brother. It's time to try these babies on."

"Sure thing, Aunt Jess!"

The two walked into the hall of the changing area, picking doors on opposite sides before each walking in. I sat on a chair outside the rooms, dreaming about what they would look like in their skimpy new bikinis. *God damn, I can't wait. What if I can get some alone time with Aunt Jess at the beach? Getting her to bust my balls while wearing something like that...* My fantasies were interrupted by the sound of Jess's voice from behind the changing room door.

"Can you come in here for a second? The back straps are a little hard to tie on this one."

*Oh fuck yes.* I quickly stood up, walking to the door and again putting on the most natural voice I could.

"Sure thing. No problem. Absolutely."

As I entered the room, I saw Aunt Jess standing in front of me, wearing only the bright red swimsuit bottoms. She was turned away from me, her arms covering her large, exposed breasts. I walked up to her, my eyes quickly moving in all directions to soak up as much of the sight as I could. 

"Could you help me tie the top? I can't quite get it."

She looked over her shoulder, her eyes meeting mine, a devilish grin on her face. She looked down, spotting my throbbing erection, no longer concealed by my hands.

"You'd better take those off while you're at it. It's not fair that only *I'm* exposed here."

Without responding, I quickly dropped my shorts, exposing myself to my aunt once again as I walked up to her. I took the bikini top, carefully draping it around her front as she moved it into position. She giggled as she noticed my trembling hands, moving her own hand back to find my exposed balls, wrapping her fingers around them and gently squeezing them.

"How about we finish what we started at your house, you little pervert?" she asked, looking over her shoulder again.

As I tried to tie the bikini top, she increased the pressure on my balls, causing me to let out a hushed moan. My trembling hands continued to fiddle with the thin straps of the swimsuit, my mind unable to focus on the fabric as all my attention was directed to her hand and the intense pain she was causing me. When I finally had the straps tied, I quickly moved my hands to her hips, grabbing them tightly as I leaned into her. 

"Aunt Jess, my balls, my balls..."

She turned to me, placing her free hand on the back of my head as she forced my face into her tits. My cock throbbed in excitement as I felt the silk-soft sensations of her barely covered breasts envelop my face. She moved her hand from my head to my balls, wrapping both of them around my nuts as she clamped down on them. My fingers dug into her hips as I started bucking my own, her tits muffling my moans. She let out a soft giggle as she shifted her hands, placing one thumb on each nut and slowly applying a pinpoint pressure to each one. My body stiffened, and my hands moved to her ass, my fingers digging into the soft flesh exposed by the revealing swimsuit. I pulled my face out of her cleavage, burying it into her neck as I whispered to her.

"Aunt Jess... I-I... I can't take anymore... I'm gonna cum..."

As my breathing became ragged, she quickly pushed me away, stepping forward and launching her knee into my exposed balls, smashing them into my pelvis and causing my hard, throbbing cock to loudly slap my stomach. The force of her knee knocked me back, causing me to tumble out of the changing room and into the hall. My hands frantically reached down, desperately clutching my throbbing balls as I rolled around on the ground. *My nuts! Oh fuck, my NUTS!* The barely clothed milf peeked her head out of the door, a playful smile on her face. 

"You'd better get back in here, or someone's gonna see that big, throbbing cock!"

As she closed the door, I forced myself to stand, hobbling to the door and grabbing the knob only to find it locked. 

"You might have better luck hiding in Natalie's room, little boy. I think she'd be disappointed if I smashed the cum out of your balls without her."

In a panic, I hobbled to the other side of the hall as quickly as my shaking legs would take me, grabbing the knob to find that she'd forgotten to lock it. As I heard footsteps down the hall, I swallowed hard before entering the room.

"Sorry, Nat, I need to-"

I went silent as I entered the room, finding my sister with only her swimsuit bottoms on, facing me with her hands adjusting her bottoms. My eyes darted south, taking in the freckles on her shoulders and modest breasts. After a second of confusion, she'd realized what was happening, furrowing her brows as she covered her tits with her hands.

"You pervert! Why the fuck is your cock out, and why are you barging in here while I'm changing?!" Her eyes shot down to my crotch. "And can you seriously not control that big, stupid cock for *one day*?!" 

She walked up to me, shooting her foot up into my balls with deadly speed and accuracy, causing a loud, sharp smacking sound to echo through the hall. I let out a cry of pain as I crumpled to the ground, my hands holding my balls as I fell onto my side. 

"Nat, my balls, my balls! Oh fuck, my balls..."

As she stared at me, desperately trying to quell the intense pain spreading throughout my body, she sat down, her hands relaxing a little but still covering her breasts.

"Alright, mister. Get over here. I'm gonna punish that big cock real quick, and then you're gonna help me figure out these stupid straps on this top."

I forced myself up onto my knees, the back-to-back devastating knee and kick making both my stomach turn and my dick throb. I looked up and stared at my sister, the sight of her naked body not helping me calm my hard dick.

"T-That's exactly why... I came in here..." I panted, trying to catch my breath. "To help with... the straps..." *A perfect lie to get out of this situa-*

"That doesn't explain why your cock is out or why it's hard!"

*...touché.*

Using only one arm to cover her chest, she pointed with her free hand at the ground in front of her, beckoning me to come closer. I scooted forward as best my failing legs would let me, sitting on my knees in front of her and spreading my legs. I stared up at her, her brow furrowed and her freckled nose scrunched, but that familiar excitement and arousal clear as day in her eyes. *This kinda works out, I guess. I still have to pretend I don't like it, but...* I spread my legs further, breathing heavily as I prepared myself for the intense pain to come. 

"Yeah, that's right... Open those legs for me! I'm gonna fuck those balls up!"

"You're obviously getting turned on by this, Nat. We've already been through this, remember. I know."

"Not this time! This is a serious punishment!"

As she told her obvious lie, she launched her foot forward, roughly smacking my balls and causing them to painfully swing back and forth. I let out a quiet cry, the pain in my already throbbing balls spreading throughout my entire lower half. I breathed heavily, putting my hands behind my back and awaiting the next kick. As she continued to deliver kick after kick, she stopped even trying to hide her arousal. Her hand drifted down, exposing her breasts as she gently slid her fingers under her swimsuit bottoms. She let out a soft moan as she started to play with herself, squirming slightly in her seat from the pleasure. After a few more kicks, she stopped, staring down at my crotch and biting her bottom lip. As she stared, the door behind me opened, and Jess, still wearing her revealing swimsuit, entered the room. 

"I wondered what was taking so long. You really can't wait until you get home, Natalie?"

Natalie didn't respond, her attention focused on my battered crotch and the waves of pleasure crashing through her as she continued to touch herself. Jess let out a chuckle, kneeling down behind me and pressing herself into my back. A shiver ran down my spine as I felt her massive tits press into me.

"Alright, if you're just gonna sit there and play with yourself, I'm gonna take care of his cock so we can go home." Jess said, smirking at her lust-stricken niece. 

Jess slowly ran her hands down my back, reaching between my legs and wrapping her hands around my balls. My body stiffened as I let out a cry of pain, my balls still throbbing from the earlier abuse. She adjusted her hands so that one was wrapped around my sack just above my balls, pulling them tight to prevent any chance of escape. She brought her free hand back, swinging it forward and roughly slapping my trapped nuts. As Jess continued to cruelly slap my quickly swelling balls, Nat moved her feet up to my hard cock, touching the soles of her feet on each side of the base. 

"N-Nat..." I muttered, the pain from Jess's ball slaps and the sensation of Nat's feet starting to send me over the edge.

"Stay there..." Nat panted as she continued to pleasure her pussy. "She's gonna fuck your baby makers up... So I'm gonna... I'm gonna..."

Nat craned her head back, opening her mouth as if to moan but not making a sound. She started moving her feet up and down the length of my cock, each stroke causing waves of pleasure to clash with the immense pain in my nuts. I started thrusting my hips in time with her feet, my head craning back and resting on Jess's shoulder.

"Nat... Oh my god, Nat... Fuck... My balls... My balls..."

Nat started bucking her hips in time with the movements of her hand. She quickened the movement of her feet as she started to arch her back from the pleasure. Seeing that her climax was nearing sent me over the edge, and as I came, I reached back, desperately grabbing the threads of Jess's swimsuit bottom. I violently bucked my hips with each shot as I came all over Nat's feet and legs. As my body relaxed, I laid back into Jess, panting desperately as I clung to her. Looking into the older woman's eyes, I nuzzled up to her neck, gently kissing her shoulder and causing her to blush slightly. 

"Alright mister, you had your fun." Jess said, pushing me off. "Get dressed so we can check out and go home."

"Just a second..." I replied, trying to catch my breath. "My head is swimming, and my balls... my balls hurt so bad..."

As Jess teased me about my whining, Nat interrupted us.

"Just a little more..." she panted. "I'm almost there... just a little mo-"

"You'll have plenty of time to finish at home, Natalie." Jess interrupted. "We should really get going."

Jess and I peeked out the door to make sure no one would catch us and moved back to her changing room. Once we were dressed, we left to find Nat sitting on the seat outside, frustration clear on her face.

"Come on, don't be like that." Jess said. "You can finish when we get-"

"I'm gonna have some real fun with those stupid balls when we get home!" Nat interrupted, looking at me with her brows furrowed and her face still flushed. "I'm like this because of you, so you're gonna take responsibility when we get home! I'm gonna smash those fucking nuts tonight!"

*Nothing about that footjob just now? I guess we're past the point of being embarrassed about this stuff, then.*

As she continued to threaten my manhood, she started rubbing her thighs together. *She threatens me because she's horny, which makes her even hornier. What a vicious cycle.* As Jess started walking to the front counter to check out, I followed along, hobbling slightly from the pain. Nat followed behind, still hot and bothered. As I stood behind Jess in the checkout line, I put my hands in my shorts pockets, gently holding my throbbing balls to find that they had started to swell. *Jesus... That knee and that kick... they weren't messing around today.* I looked back at Nat, still pouting and her face still flushed as she fidgeted in place behind me. *And I'm not gonna get a chance to rest when we get home, either.* I swallowed hard, both scared and excited about what kind of punishment my bratty little sister would have for me when we got home. 

\*\*\*

Thanks for reading! It's been a while since I've written anything... hope you liked it!