My Sister Discovered My Fetish and Decided to Punish Me

[All the characters in this story are adults]

[Bruno]

I have secrets that make me a little ashamed. Maybe because I’d never been with anyone, I ended up collecting some pretty weird fetishes, which started off mild and then went off the rails. First I looked for videos where the woman was in charge; then I moved on to rougher stuff, hits, punishments, male submission. I’d spend hours watching leather-clad dominatrices kick guys in the balls while they were on their knees, make them suck on their toes, grab them by the dick and lead them around the floor like dogs. And when I thought it couldn’t get any more twisted, I started reading brother-and-sister stories, incest fantasies where the sister discovered her brother’s dick and forced him to come all over her. That was when I started looking at Nadia differently.

Our relationship had always been distant. I shut myself away in my room, she in hers. We hardly talked, mostly at the table, and even then with our phones in our hands. She’s gorgeous: light brown skin, thick black hair she treats like a treasure, inherited from our mother. Around the house she wears almost nothing—tiny shorts that outline her cunt and bite into her ass, and loose blouses, sometimes with nothing underneath, with her brown nipples peeking out whenever she bends over.

As if someone had flipped a switch, my brain started registering every detail. Before, I used to call her ugly just to annoy her; now I had to force myself not to look at her tits at dinner, and the more I forced myself, the more I thought about them, about how they’d move freely under the fabric, what color the nipples were, how one would feel in my mouth. When she came down the stairs in a hurry and everything bounced under the cloth, it was almost hypnotic. Trying not to look made me obsessive. I’d stare at anything nearby and sneak glances out of the corner of my eye while every part of my body begged me to look straight at her. It was torture. I jerked off thinking about her almost every night, biting the pillow so nobody would hear me, imagining she came into my room, ripped the sheets off me, and grabbed my dick with that mocking face she made whenever she won at something.

***

[Nadia]

My idiot brother was at it again, staring at me during dinner. Just for a split second, but I’m sure of it. Then he acts like he wasn’t, so he won’t get himself into trouble. If I’m honest, I find it funny that he wants to look and can’t, because I’m his sister.

When we were kids we played all the time. We threw rocks at bottles in the yard, he came with me to the corner shop and bought me candy with his allowance. We loved each other a lot, but the years pulled us apart even though we live under the same roof. One dawn I went downstairs for water and, as I passed his always half-open door—he hates feeling trapped—I heard fabric rustling. I just peeked in and understood what it was. The comforter was moving with a rhythm I’d never heard in real life, but recognized immediately: a hand going up and down, a clenched fist around a dick, that steady back-and-forth of a guy jerking off. There was a bluish glow: he must’ve been watching something with headphones on. A small, dry, muffled groan slipped out of him, and I froze, knowing my brother was masturbating a few feet from me.

From then on I knew my brother had changed. And so had I. Nothing bad, but I felt like things would never be the same again. The weird part is that, besides a little disappointment, I was left with curiosity. What the hell was he watching? How big was it? That night, in my bed, I slid my hand between my legs thinking about the comforter’s rhythm and came faster than I would’ve wanted to admit.

***

The chance came one night, when we were already going to bed and Mom shouted up from downstairs.

—Bruno, you didn’t take out the trash!

—I forgot! I’ll take it out tomorrow! —he yelled back.

—No, tomorrow the garbage truck comes early. Do it now.

I walked toward my room. It took him a while to go out; I guess he was annoyed at being interrupted. As soon as I heard him go downstairs, I knew it was my moment, and that maybe it wouldn’t come again. I went in expecting to find the phone on the bed, but the laptop was open. From a distance I saw a woman dressed in leather and a man kneeling in front of her. I turned the screen. I didn’t understand the title, just caught a couple of words in English about domination, so I rewound the video to see what it was about. The woman had the guy on his knees, his dick out and hanging miserably, and she drove a hard knee straight into his crotch. The guy doubled over with his mouth open in a silent scream and she grabbed his cock with her gloved hand, twisted it and forced him to lick the tip of her heel. I opened my eyes wide. My brother is really fucking crazy.

There were dozens of tabs open. I clicked on other ones: more of the same, terms I didn’t know, punishments, submission, ballbusting, cbt, femdom. One had a huge text where some woman made her slave drink semen after breaking him with blows; I didn’t even get far enough to read it, though just seeing it made me uncomfortable. And another was a story titled “My Sister Dominates Me,” with the first scene describing how she grabbed his balls for the first time and he came in his pants. I’d seen enough. I put the laptop back the way it had been and ran back to my room.

I flopped onto the bed staring at the ceiling, with too much to process. Was he fantasizing about me? Did he get off on being hit there, or just on watching other people? Would he like it if it were me? I told myself I was crazy, that I’d never do something like that, though I admitted the idea of having him at my mercy didn’t seem so absurd. I decided to ignore the whole thing, leave him to his stuff and go on as always. But curiosity was eating me alive, and between my legs my panties were already wet just from thinking about it.

***

[Bruno]

When I came back from taking out the trash and opened the laptop again, my blood ran cold. The browser was on the incest story I’d meant to read, not on the video I’d left. Someone had touched it. Nadia had been in there.

It couldn’t be. Did she see the brother tab? I felt everything going to hell. The uncertainty was killing me, but the best thing was to pretend nothing had happened. Those doubts took away my desire to keep going. I lay down thinking maybe I should leave all that behind forever. Then a new fantasy crossed my mind: me reading those stories and her walking in to tell me she knew everything, not to worry, to grab my dick over my pants and whisper in my ear that she wanted it too. That image, against all anxiety, ended up winning. I was hard all night, jerking off twice in a row, imagining her kneeling in front of me with that mocking smile, spitting on the tip of my cock before taking it into her mouth.

***

[Nadia]

What was done was done. Now I knew my brother had weird fantasies about me, and I was ashamed to admit the idea didn’t bother me. All night I kept wondering whether I should find out if he really liked that, or if he just got off on watching it happen to other people. I ended up with two fingers inside me, imagining it was him who was folding over while I squeezed, and I came biting the pillow so nobody would hear me.

The next day, when Mom called us to eat, I came down in a low-cut blouse that showed the swell of my tits and the shortest shorts I owned, so short I could feel the waistband biting into half my ass. This time I was the one watching him. It was obvious how he glanced at me out of the corner of his eye, a split second each time, his gaze fixed on my cleavage and then dropping to the bulge of my nipples showing through without a bra. Feeling that attention did something strange to me; part of me wanted to show more, even though I knew it was wrong. When I bent down to pick up my napkin, I deliberately let it fall, and I felt the fabric open up, giving him a clear view. I heard him swallow.

We finished eating. He was about to go lock himself away and everything would go back to routine, and part of me didn’t want that.

—Let’s watch a movie in the living room —I said before he went upstairs.

—Which one?

—Any one.

—A horror movie?

—Those keep me up all night!

—Don’t be a baby, you’re grown up already.

—Whatever…

He put on “The Omen,” the first thing that came up. Mom had already gone upstairs to read, so we wouldn’t see her until morning. We sat a little apart.

—That movie is a million years old. Wasn’t there something from this century?

—It’s one of my favorites. Besides, we haven’t watched it since we were kids.

That made me remember when our parents had banned it and we used to sneak it on in the middle of the night. It scared me so much I ended up sleeping with him. Fifteen minutes passed and, since the beginning was slow, we talked on and off. It felt good to get that closeness back. I settled in, resting my head on the back of the couch and putting my feet up on his legs, leaving them dangerously close to his crotch.

—Get your feet off me! —he said, nudging them a little.

—You picked the movie, let me be comfortable at least.

Something told me he was playing along, that deep down he loved having them there. There was a slight tension we both hid behind hostility.

***

[Bruno]

Having her feet that close was a sweet torture. I felt the warm sole brushing my thigh, climbing every time she shifted, and my dick started swelling against my pants without me being able to do anything. My body pretended to move them away so she wouldn’t suspect, but I couldn’t push back for real. I wanted them to stay there, to slide another four inches up and touch me where I was begging to be touched. After a while she pulled them back, went to the kitchen for water, and came back to sit right beside me, pressed against me, with the whole couch empty. The heat of her thigh against mine burned through the fabric. Then she rested her head on my shoulder and I smelled her hair, a clean scent with a sweet undertone that made me close my eyes. Having her there like that, connected again after so long, with her breast pressing against my arm and the hard nipple perfectly noticeable through the blouse, woke an enormous desire in me. My dick was throbbing painfully against my pants. I wanted to hug her, slip my hand into her neckline, rip off those little shorts and bury my face between her legs, but my fear of startling her won out and I did nothing.

***

[Nadia]

Leaning on his shoulder, I tried to follow the movie, but curiosity wouldn’t let me. I could smell his neck, feel his heavy breathing, and out of the corner of my eye I saw the bulge start growing in his pants.

—Do you have a girlfriend, Bruno?

—No.

—Why? Doesn’t anyone want you?

—I’m not that interested in the whole thing.

—Maybe you’re ugly.

—Almost as ugly as you.

—You know I’m not ugly.

—Think whatever makes you feel better.

And that’s when the plan came to me.

—If you thought I was ugly, you wouldn’t be staring at my tits every day.

—Dream on.

—Don’t you have the balls to admit it?

—More like you don’t have anything to show off. You’re flatter than a board.

It was now or never. I had the perfect excuse. I sat up off his shoulder and punched him hard right between the legs. His loose pants didn’t protect him at all; I felt the shape of the balls give under my knuckles, flatten against the bone, and I also noticed the swollen dick beside them, hard and hot. He let out a muffled cry, a short howl that got stuck in his throat, and doubled over toward the couch arm, clutching his crotch with both hands. I laughed, though inside I felt a little guilty. Maybe I’d gone too far. But I also felt a heat between my legs I hadn’t expected, a warm wetness soaking through my panties all at once.

***

[Bruno]

I couldn’t believe what she’d done. The blow landed direct, with no cushion, and the pain shot through my stomach like electric nausea, that dull burn that settles in your gut when someone gets you good in the balls. I curled up on the couch with my face against the upholstery while she laughed. I could feel my balls throbbing, pulsing against the hands I’d been too late using to protect them, and I thought I was going to throw up. But after a few seconds, on top of the pain, something else started growing: an excitement I hadn’t expected, a jolt that hardened my dick until it was about to burst. I’m going to remember this every night for the rest of my life. Her fist, my own body giving way, her laugh of pleasure. I was so hard it hurt almost as much as the hit.

—Ow, that hurt, dummy.

—You deserved it.

—You went too far, Nadia.

—Don’t be a crybaby, it was just a little tap.

The sharp pain faded and only a dull, throbbing echo remained, one my mind clung to because it might not happen again. My dick stayed hard as a rock, outlined under my pants, and there was nothing I could do to hide it.

***

[Nadia]

I went to the kitchen looking for something sweet. I’m not proud of it, but I enjoyed that hit: feeling the bulge in my fist, noticing the swollen dick beside the balls, seeing him folded up pleased me more than I expected. My cunt was throbbing, my panties wet and sticking to me, and my legs were trembling just a little. When I came back and sat down, I glanced at his crotch and nearly dropped the candy. He was rock hard. The whole shape showed under his pants, the swollen head pointed upward, and I could even make out a little wet patch on the fabric. He thought the darkness would hide him, but a lit-up scene in the movie gave away the bulge, bigger than normal, thicker than I would’ve imagined. I looked away right away, heart pounding hard and cunt leaking. He’d enjoyed it, and now I had him where I wanted him.

—Feeling better, little brother?

—Yeah, you don’t hit that hard.

—Oh, really? Maybe I should try again… —I raised my fist, threatening.

—No, wait!

—That’s what I thought.

Knowing he was afraid of me gave me a strange, exciting power. I stretched out again and put my feet back in his lap. Every now and then I moved them, pretending to get comfortable, trying to brush against him. Now and then I used my big toe to rub the side of the bulge and felt him jerk. At the most intense moment of the movie I let a foot drop onto his crotch like it was an accident, and I felt something firm, hot, throbbing under my sole. I held it there a couple seconds longer than I should have, pressing just enough to feel the shape, and he stayed rigid, not breathing. I pulled away quickly. I had already confirmed what I wanted: my brother had a hard-on for me.

***

When the movie ended, he stood up.

—I pick the next one —I said.

—Keep dreaming —he replied, and playfully tapped my head with his fist, like when we were kids.

I jumped up to shove him and make him trip, but he saw it coming and hooked my ankle with his. I fell on top of him and we both ended up on the floor, wrestling. I felt the rock-hard bulge press into my thigh when I fell, and he jolted as if he’d been shocked.

—What’s wrong with you, you psycho? —he said, laughing.

—I won. You’re on the floor, so I pick the next one.

—We both fell. You didn’t win anything.

I loved that he went along with it. We struggled for a while; I was using all my strength and he clearly wasn’t. Even so, it was hard for me to keep him down. I was trying to bend one of his legs to make him give in when I saw them: within reach of my hand, outlined under the stretched fabric, his dick so hard you could even make out the vein on the side and the balls tight against his pants. I didn’t want to ruin the moment, but I couldn’t resist.

—Don’t hate me for this, little brother —I said, and wrapped my whole hand around him.

I grabbed his whole package at once, cock and balls together, and felt the heat through the fabric, the absurd hardness of the dick against my palm, the weight of the balls between my fingers. He stayed motionless, face down, not saying a word.

—Are you giving up, or do I leave you unable to have kids?

—That’s cheating.

—It’s not cheating, it’s part of your body. And you’re stronger, so we’re even.

The adrenaline of the fight started to fade and I realized how much I liked having him like that, subdued, his hard cock in my fist, feeling like I had all the power and he couldn’t do anything. I ran my thumb over him, along the length of the dick, measuring it without meaning to, and felt warm wetness staining the fabric right at the tip. He was leaking a little just from being touched. I squeezed a bit, to test it, closing my fingers over the balls.

—Ah! It still hurts from the hit, don’t squeeze!

—Still think I’m flat?

—Uh… yeah? —I squeezed again, harder, feeling the balls roll under my fingers—. Ah, no! You’re not flat!

—That’s more like it.

***

[Bruno]

I couldn’t believe what was happening. My sister had me pinned to the floor, her hand closed around my dick and balls, squeezing me until I saw stars. I felt her thumb slide over my glans through the fabric, felt her palming the whole shape, felt the weight of my package in her hand. It was like several of my fantasies had suddenly come true. I didn’t want it to end, but I also didn’t want her to realize how much I was enjoying it. Feeling her fingers tighten around me gave me a strange calm, a calm that shattered into agony every time she squeezed my balls and made me bite the floor. She had me in her power, and I liked that more than I’d ever admit. I felt the tip of my dick getting wet, precum soaking through the fabric, and I prayed she wouldn’t notice.

My body responded completely. My cock was throbbing with every beat of my heart, swollen to the max, so hard it hurt. I prayed she wouldn’t notice; enduring the discomfort of lying face down was better than her discovering my erection. She threatened to squeeze harder if I didn’t give up. I knew she couldn’t really do any serious damage, but I also knew perfectly well she was capable of an intimidating punishment.

—Are you giving up, or do I have to mash them up?

—Mm… let me think about it… —I answered, and knew I’d sealed my fate.

—Whatever you want.

Instead of squeezing, she let go. I thought she was releasing me, but she only readjusted her hand, felt me out, moved the cock aside to leave the balls exposed and, when I was defenseless, with my nuts spread and unprotected, the second blow came. A closed-fist punch, dry, direct, hitting both testicles at once and crushing them against the pelvic bone. An immense pain tore through me, surged up my stomach like a blaze, blurred my vision. I twisted, tried to cover myself and she pushed my hands away with her other hand.

—Stay still, or I squeeze again! Giving up now?

—Ah, it hurts, Nadia, let go!

—I guess you’re not giving up, then I’ll give you another…

—No! I give up! —I said quickly.

She let go and stood up, victorious. I was still face down, feeling the balls pounding with a dull burn, and at the same time feeling the dick twitch against the floor, ready to burst. I felt a hot spurt escape against the fabric, just a little, an involuntary leak that stained my underwear. I almost came from that alone.

—I won, little brother. I pick the next movie.

I stayed on the floor, curled up. I felt her foot rest on my back, mocking, and then lower and press for a second right on my ass, applying pressure.

—Come on, don’t exaggerate —she said, cynically. Then she bent down, kissed me on the cheek, so close to the corner of my mouth it almost brushed my lips, and went up to her room.

I stayed there a while. The pain eased, but the erection didn’t. I could feel it throbbing inside my pants, wet with my own semen. I waited to hear her door close before getting up. Watching her go up, her perfect figure disappearing on the stairs, her perky ass moving under those little shorts, was the cherry on top.

***

[Nadia]

In my room I felt really strange. I felt connected to Bruno again and, at the same time, guilty: I’d confirmed that this excited him, and still I’d kept going. I’d liked it. Having him on the floor, at my mercy, feeling his body respond while I squeezed him, the dick swelling in my hand the harder I squeezed his balls, turned me on in a way I didn’t know before. My panties were soaked, so much that I could feel the dripping running down the inside of my thigh.

I knew it wasn’t right, but I’d do it again. In fact, I wanted to do it again right then. I yanked off my little shorts and panties in one pull, leaving me naked from the waist down, and threw myself on the bed with my legs open. My cunt was leaking, swollen, with the lips parted and the clit throbbing hard against the pad of my finger. I took my vibrator from a box hidden in the drawer, small but noisy, and covered myself with the comforter to muffle the sound.

I turned it on at the lowest setting and pressed it straight to my clit. A shiver ran up my whole back. With my other hand I squeezed a breast, pinched my hard nipple between thumb and forefinger, imagining it was him doing it, kneeling at my feet, his dick sore and his balls red from my blows. I turned the vibrator up to the second level and arched on the bed, biting my lip so I wouldn’t scream. With two fingers I spread my cunt lips, stroked my soaked entrance, and slid first one and then two fingers deep inside, searching for that spot that made me lose my mind. I curved them inside me while the vibrator worked my clit nonstop.

Thinking about how I’d had him subdued a little while earlier, the pleasure was enormous. I imagined squeezing his balls harder, forcing him to pull out his dick and jerk it in front of me while I watched, ordering him to come whenever I wanted. What brought me off in the end was imagining something new: him sitting on the floor, kneeling, with a hard, dripping cock, my bare foot on his body, squeezing his balls with my toes while he kissed my legs, my knee, slowly climbing to my thigh, burying his face between my legs to lick my cunt desperately. I imagined him licking me from bottom to top, his tongue fixed to my clit, and me grabbing his hair, pushing his head into my cunt, forcing him to suck until he choked. That sense of power made me finish like never before, with the vibrator locked on my clit and my fingers buried to the knuckles inside my cunt, feeling my walls clamp down in spasms, soaking the sheet with a hot gush. I covered my mouth with the pillow so I wouldn’t wake Mom, howling into the fabric like a bitch in heat.

***

[Bruno]

When I heard her door close, I went to my room. I still hurt—the balls were throbbing with a dull pulse, sensitive to the slightest brush of my underwear—but I needed to unload everything in my head. I tore off my pants and the stained boxers and threw myself on the bed with my dick pointing at the ceiling, harder than it had ever been in my life, the tip shiny with precum sliding over the glans. I grabbed it in a tight fist, squeezed hard, and started moving fast, not wanting to drag it out.

I remembered her hands closing around my package, the weight of my balls in her palm, her thumb running over my dick through the fabric, the tug to expose my nuts, and then the punch. I squeezed my balls with my other hand while I jerked off, imitating what she’d done to me, trying to reproduce that pain with pleasure. I closed my fingers over the aching testicles and let out a groan, feeling my dick swell even more in my fist.

I imagined her standing at the foot of the bed, with that mocking smile, ordering me to jerk off for her, to pump faster, to show her how her brother came. I imagined her putting one foot up on the bed, resting the sole on my balls and pressing, squeezing my nuts with her toes while she looked down at me. I imagined her spitting on the tip of my cock, rubbing the saliva in with her thumb, ordering me to finish on her tits, on her face, wherever she wanted.

The memory of that pain and her laughing in enjoyment made me finish violently, deliciously, unlike anything before. My dick exploded in my hand in a series of thick, hot spurts that splattered my chest, my stomach, my chin, far more than usual, as if I’d been saving semen for weeks. I lay there panting on the bed, covered in my own cum, my balls throbbing and the stupid smile of someone who knows it happened on my face.

I don’t know if I’ll ever feel anything like that again. What I do know is that, for a good while, I won’t need the internet.