The summer heat pressed down on our old family house like a heavy hand. I’d just turned 25, home from college for a few weeks, and my 22-year-old sister Kayla had blossomed into something dangerous. She was the definition of a slutty sister—tight shorts that rode up her ass, crop tops that barely contained her full, heavy tits, and a constant smirk that said she knew exactly what she was doing.
Kayla had always teased me. Brushing against me in the hallway, “accidentally” leaving her door open while changing, whispering filthy jokes just loud enough for me to hear. But this summer, something had shifted. Our parents were gone for two weeks on a cruise, leaving us alone in the big empty house. I’d found her hidden stash of toys and the dirty stories she wrote on her laptop. Incest fantasies. BDSM. Submission.
I decided it was time to give my slutty sister exactly what she craved.
It started on a Thursday night. I waited until she came home from her shift at the bar, tipsy and flushed. She sauntered into the living room in a tiny black skirt and a white tank top, nipples clearly visible through the thin fabric.
“Miss me, big brother?” she purred, flopping onto the couch and spreading her legs just enough to flash her panties.
I stood over her, arms crossed. “You’ve been a fucking tease for years, Kayla. Tonight that ends.”
Her eyes widened, but there was excitement there too. “What are you gonna do about it?”
I grabbed her wrist and pulled her up. “I’m putting my slutty sister on the wooden pony.”
She laughed nervously, but followed me down to the basement where I’d spent the last few days building it. A sturdy wooden plank mounted on a sturdy frame, the top edge sanded smooth but narrow—about an inch wide. I’d added eye hooks for ropes and straps. Classic wooden pony design, inspired by all the dark stories I knew she read.
“Strip,” I ordered.
Kayla hesitated only a second before peeling off her clothes. Her big tits bounced free, nipples already hard. She was shaved smooth, her pussy glistening. My cock throbbed at the sight of my own sister naked and obedient.
I bound her wrists behind her back with soft but firm rope, then helped her straddle the wooden pony. She gasped as her weight settled onto the narrow edge, pressing right against her sensitive pussy and clit.
“Oh fuck… it’s harder than I thought,” she whimpered, rising onto her tiptoes to relieve the pressure.
“That’s the point,” I said, securing her ankles to the base so she couldn’t step off easily. “You’re going to ride it until you learn who owns this slutty sister pussy.”
For the first ten minutes, Kayla tried to play tough. She rocked her hips, grinding against the wood, mixing pain with pleasure. Her breathing grew ragged, tits heaving with every shallow breath.
“Look at you,” I mocked, circling her. “My perfect little incest slut, riding the wooden pony like the whore you are.”
I reached up and pinched her nipples hard, making her cry out and sink lower. The edge bit deeper into her folds. She moaned loudly, a sound that was half pain, half desperate arousal.
“Please… it hurts but it feels so good,” she gasped.
I pulled out my cock—thick, hard, and aching for my sister. Standing in front of her on the pony, I slapped my shaft between her heavy tits.
“Titty fuck me while you ride,” I commanded.
Kayla leaned forward as much as her bonds allowed. I pushed my cock into the warm valley of her breasts. She squeezed them together around me, the soft flesh enveloping my shaft as she bounced slightly on the wooden pony. Every movement made the wood grind against her clit.
“Fuck yes,” I groaned, thrusting between her tits. The sight of my slutty sister’s face contorted in tormented pleasure, her tits jiggling around my cock, was pure heaven. Precum smeared across her chest as I fucked her cleavage harder.
She was getting close. Her thighs trembled, struggling to stay on tiptoe. I pulled back just as she was about to cum.
“Not yet,” I growled. “Bad girls don’t get to cum so easily.”
I left her on the wooden pony for nearly an hour, alternating between edging her with my fingers, a vibrator pressed against her clit, and more titty fucking. Her juices coated the wood, dripping down the sides. Tears of overwhelming sensation ran down her cheeks, but she kept begging.
“More, brother… please use your slutty sister.”
I finally lifted her off, her legs shaky. I carried her to the old couch in the basement and bent her over it. Her pussy was swollen, bright red from the ride.
I slammed into her from behind in one brutal thrust. “This is what you wanted, isn’t it? Your brother’s cock destroying your incest cunt after the wooden pony broke you.”
“Yes! Fuck me, own me!” Kayla screamed, pushing back.
I fucked her hard, one hand in her hair, the other slapping her ass. Then I pulled out and made her kneel. I titty-fucked her again, this time rougher, my cock sliding between her spit-slick breasts while she looked up at me with worshipful eyes.
When I was close, I shoved back into her pussy, pounding deep.
“Gonna cum inside my slutty sister,” I warned.
“Do it! Breed me, brother!”
I exploded, filling her with thick ropes of cum. She came hard around me, her walls milking every drop.
But that was only the beginning of our two-week incest BDSM marathon.
The next day I upgraded the wooden pony session. I added nipple clamps connected by a chain to a weight between her legs. Every time she shifted on the narrow edge, the clamps tugged viciously on her sensitive buds. I made her ride longer, blindfolded, while I described all the filthy things I was going to do to her.
“You’re my personal slutty sister fucktoy now,” I whispered, circling her as she whimpered and ground helplessly on the wood. “No more teasing. Just obedience and pain and pleasure until you can’t think straight.”
I rewarded her endurance with more titty fucking. This time I had her lie on her back on a bench, head hanging off one end, tits pushed together. I straddled her chest and fucked her cleavage while occasionally slapping my cock against her face. She licked and sucked eagerly, desperate for more.
Later that night I tied her spread-eagle on her bed and used the wooden pony plank as an improvised spanking tool—light taps at first, then harder across her tits and inner thighs before sliding it between her legs again for another short, agonizing ride right on the mattress edge.
By the end of the first week, Kayla was fully broken in. She greeted me every morning on her knees, begging to suck her brother’s cock. She started calling herself “your slutty sister” unprompted.
One particularly intense evening, I set up the wooden pony in the living room with mirrors all around so she could watch herself. I dressed her in nothing but thigh-high stockings and a collar that read “Incest Whore.”
She straddled it eagerly this time, already soaked. I stood in front of her and used her tits again—long, slow titty fucking strokes while she rocked on the pony. The mirrors reflected every angle: her flushed face, bouncing breasts gripping my cock, the slick wooden edge splitting her pussy lips.
I edged her mercilessly. Whenever she got close, I pulled her down harder onto the pony or tightened the ropes. Her orgasms, when I finally allowed them, were shattering. She squirted for the first time in her life, soaking the basement floor while screaming my name.
The final night before our parents returned, I went all out.
I bound Kayla in a strict hogtie on the floor, then positioned the wooden pony so she had to arch painfully to reach it with her pussy while I fucked her mouth. After throat-fucking my slutty sister until tears streamed down her face, I untied her and made her mount the pony one last time.
This session was the longest yet. I added a vibrating egg inside her, set on low, while the external pressure of the wood tortured her clit. I stood on a stool so I could titty fuck her from above, her head tilted back, mouth open.
“Tell me what you are,” I demanded, sliding my cock between her perfect tits.
“I’m your slutty sister,” she sobbed with pleasure. “Your incest BDSM toy. Use me however you want… punish me on the wooden pony forever.”
I came all over her tits and face, then finally let her cum. She shattered completely, body convulsing as multiple orgasms ripped through her. I held her afterward as she came down, stroking her hair.
When our parents got home, Kayla was a changed woman—still the flirtatious slutty sister on the surface, but now secretly obedient to her brother’s every command. We stole moments whenever we could: quick titty fucks in the laundry room, risky fingering under the dinner table, and late-night wooden pony sessions in the basement when everyone was asleep.
Our forbidden incest BDSM relationship had only just begun. My slutty sister had ridden the pony into total submission, and I was never letting her go.
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