Someone was watching me. I didn’t have to look to know who it was. It was my 18-year-old stepbrother, Alex. He was standing just outside my door, a faint sliver of light from the hallway vanishing as he pressed his face to the small, barely-there gap where the doorknob’s base was a little too small for its opening—a quirk from my father’s clumsy attempt at a repair.
I suppressed a smirk. So predictable. He did this every time our parents went out.
Tonight, after our parents left for their weekly “date night,” Alex and I had hung out for a while before I announced I was going to take a shower. He’d barely looked up from his game, but I’d felt his eyes trace my figure, taking in the short shorts and loose tank top. I knew he was just waiting for the opportunity to watch me. Why wouldn’t he?
It was only natural that a horny high school senior would want to peek at his new, hot, 21-year-old stepsister. When our parents got married and we all moved in together at the beginning of the summer, I figured he’d try once and that would be it. I kept myself in shape, maintained my long brown hair, and wore clothes that made the most of my C-cup breasts and round ass. But I also knew I had one thing most guys didn’t expect from a girl.
I had a dick. And not just any dick—a dick bigger than most men’s, with a set of golf-ball-sized balls to match. It was 10 inches long and as thick as a soda can when fully erect. It was the reason I’d never had a serious boyfriend and why my pussy was still untouched.
Then, a couple of weeks after I got back from college, he’d walked in on me in the shower. He got a full view of everything I had to offer. He’d just stood there, jaw slack, before sputtering an apology and slamming the door shut.
He’d been different after that. Distant. We were never in the same room for long. But eventually, things settled back into our pre-marriage routine. That’s when I noticed his peeping.
To be honest, I was flattered. So many guys had backed off when they heard my reputation for not putting out, but here was Alex, looking at me with desire, even after knowing my secret. His attention was thrilling. I started seeing him differently, too. I noticed how much he’d matured in the four years I’d known him. He ran track, so he had a lean, athletic body, and his dark, raven hair and fair skin made him exactly my type.
I started exaggerating my movements to give him better views—leaning over to dry my legs, swaying as I dried my hair. A few times, I even touched myself while he watched, coming instantly. But I was still hungry for more. I’d shift my balls aside, slip a few fingers inside my pussy, and moan loud enough for him to hear, my other hand playing with my breasts.
Once, stifling a laugh, I moaned, “Ohhh, A-A-L-E-X.” I heard a thud from my door and found a small wet spot on the floor a few minutes later.
This time, I had a plan. I’d found his browser history a few days ago, filled with videos of shemales dominating men. I knew I needed to get him nice and horny, but I didn’t want him to finish. So, I put on a show just long enough to get him hard, then I put on my robe and left the room.
Unsurprisingly, I found Alex exactly where I’d left him, downstairs. I sat in the chair next to the couch he was on, putting my leg up on the coffee table and letting my robe slowly slide down my thigh. I shifted, and my shaft flopped out, exposed.
I had to give Alex credit; he didn’t react at all, though I noticed him pausing his game to look at me more often when I was talking. Finally, I announced I was going to bed. We walked up the stairs together, said goodnight, and I slipped into my room.
I grabbed my phone and opened the app for my action camera. I had strategically placed it in Alex’s room earlier that day. The app gave me a live feed, essentially a spy cam. I watched him get ready for bed, then pull out his laptop and put on headphones. I could see the screen, and I watched as he pulled up a porn site. I had him now. He browsed for a moment, selected a video, and took out his stiffening cock. It was the first time I’d seen it, and I was impressed. Not as long or thick as mine, but definitely bigger than average.
I quietly opened my door and tiptoed down the hall. I hit “send” on the email I had prepared. I saw him open it on my camera feed. Then, I put my hand on his doorknob and waited for my cue.
“Alright Alex, I think I’m going to take a shower now! Be back in a bit,” Blair said as she started for the stairs. I took a long, sidelong glance at her legs and ass in those short spandex shorts she was wearing. I mumbled, “Alright,” hoping she didn’t see the rapid excitement I was feeling.
I waited a few minutes until I heard her bathroom door open. I paused my game and slipped as quietly as I could up the stairs, kneeling in front of her door. I pressed my face against my favorite spot in the whole house: the small hole in the door where the doorknob was. It was barely big enough for one eye, but it was a clear and unobstructed view into Blair’s room.
My breathing quickened as she dried her legs, bending over to show off that nice ass of hers. Then she shook her breasts just right as she toweled her hair. I slipped my hand down my pants and wrapped my fingers around my cock as she laid on her bed and began stroking herself, lightly moaning.
Then, my heart sank. She was standing up. She reached for her robe, and I knew that was my cue to leave. I tiptoed back downstairs and picked up my game. Twenty seconds later, Blair came strolling down in her tiny robe that showed way too much skin.
She sat in the chair to my left, and I had to use my peripherals to watch as her robe slid down her leg. Then she shifted, and her beautiful cock flopped out. I used every ounce of willpower I had not to react.
“Okay Alex, I don’t know about you, but I’m tired as hell and want to go to bed!” she chimed.
“Yeah, I’m pretty beat too,” I responded, saving my game and turning off my console.
“The old-timers should be home in an hour or so, but we should lock up and turn the lights out just in case, right?” she yawned. I nodded, and we went to work, meeting back up at the base of the stairs. We climbed them together and said goodnight at her door.
My balls were aching. Blair was the biggest tease ever. I stumbled through the pitch-black hallway, my fumbling hand finally finding my doorknob.
I changed into my pajama bottoms, sat at my desk, and pulled out my laptop. I put on my headphones and pulled up my favorite porn site, typing in a few of my favorite search terms to check for new shemale videos. I saw one new one with a girl with a big cock standing over a bent-over guy in the picture.
I clicked on it and the opening moans filled my headphones. I reached down and freed my hard manhood. Suddenly, my computer chimed with a new email. From Blair? That was odd. I didn’t even know she had my email. It had a video attachment.
Something inside me told me to open it. It was two minutes long.
Blair’s head and shoulders popped up on the screen. Behind her was her bedroom door. “Hey Alex,” she began in a sultry voice. “Soooo, I know you’ve been peeking on me the last couple of weeks.” She said it sluttily, smiling at the camera.
What the fuck? She knew? And she never said anything? The video continued.
“I know you enjoy seeing my body,” Blair said, making dirty faces. She stood up slowly, more and more of her body appearing on screen. It was obvious she wasn’t wearing a shirt.
“I know you like looking at these tits,” she said, her breasts filling the screen. She reached up and began fondling them. “Oh yeah, I bet you wish these were your hands running all over my nice big tits, huh? They’re so nice and firm, baby!” She turned around, angled the camera down, and showed off her huge ass. “And how about my butt? You like that, too, don’t you? Yeah, you do, you dirty little boy…” A smacking sound drowned her out as she spanked herself.
“But I know what you really want,” she breathed. “You want something special, don’t you?” My heart pounded in my chest. Blair turned around painfully slow, but finally, the image of her huge cock filled the screen. I released a pent-up breath. The object of my desires for the past month was paraded in front of me, so close, but so far away.
“You want my cock, don’t you?” she squeaked. “You want my nice big girly cock, don’t you?” I subconsciously nodded yes to the video.
“You want to feel my throbbing cock in your hands, don’t you?” I nodded again. She ran her hands up and down her shaft, teasing me.
“You want to feel it in your mouth? You want to taste it? Want to suck all the cum out of my balls and swallow it for me?” I nodded even harder. That was exactly what I wanted. I’d fantasized about giving that beautiful piece of cock meat the most wonderful blowjob ever.
Then, the final tease: “And I bet you reallly, reeeaaallly want to bend over and let me fuck your ass as hard as I want, for as long as I want, don’t you?” I nodded so hard I thought my head would fall off.
The video concluded. “Then all you have to do is one little thing for me! Can you do one little thing for me, dear Alex?” Blair’s voice asked sweetly.
“Oh GOD yes, I’d do anything for that,” I muttered to myself.
She giggled. “Then all you have to do for me is turn around and suck my cock, my little cock-sucking brother!” The video ended.
I hesitated, but I spun around in my desk chair, and my heart stopped. Standing behind me, fully naked, one hand on her hip and one hand slowly stroking her massive erection, was my beautiful stepsister, Blair.
“Well?” she asked. “You said you’d do ANYTHING for me, didn’t you? Get sucking, sweetie!”
I practically leapt across the room to fall to my knees in front of her. I finally grasped the object of my sexual desires, and it felt just as soft and firm as I had hoped. A broad grin stretched across both our faces as we gave in to what we’d wanted for a long time.
I leaned my head forward and stretched my mouth open as far as it could go to fit the head of her cock. I bobbed up and down on it. It was warm and a bit salty. I loved it. It felt right.
Blair’s hands rested on my head, helping me establish a rhythm. I tried to deep-throat her length but could only manage three or four inches before choking.
“Oh my God. You have no idea how good this feels, Alex! You were born to suck my cock!” she hissed.
I pulled off and grinned up at her, using both hands to jack her off. “I can’t tell you the amount of times I’ve fantasized about you being down there, your smiling face looking back up at me,” she breathed.
“I can’t tell you how many times I’ve fantasized about being down here!” I told her. I got back to sucking, focusing mainly on the head but occasionally running my tongue up and down the shaft. I knew where this was going, and I hoped we had lube.
“Oh. Baby. Yes. Just like that,” she moaned. “Oh, that feels so good! I might cum soon!”
Encouraged, I sucked harder and faster. I reached up and fondled her giant balls with one hand. Her moaning increased, and her hands pulled my head down further. Finally, she peaked. Her cock twitched in my mouth as she shot four huge spurts of cum down my throat. I choked, not able to swallow it all. I had to pull off. She was still coming, and a couple more large jets of cum rocketed out, splattering all over my face.
“Holy fuck, that was good!” she said. “But you know this isn’t all I want, right?” I nodded eagerly and stood up. I went to clear off my bed for us, but she couldn’t wait. She grabbed me and bent me over the side of the bed. She yanked down my pajamas and fondled my ass.
“Oh, I’ve wanted this ass for so long! It’s so nice and plump and fuckable!” she exclaimed. I heard a tube pop and glanced back to see her dip her finger into a tub of Vaseline. She slathered her finger and slowly inserted it into my butt.
“Ooooh,” I groaned at the new sensation. After a few slow thrusts, she pushed her middle finger in. The stretching was uncomfortable but not painful. A few more thrusts, and she added a third finger.
“Oh yeah, your ass is gonna be nice and ready for my thick cock, baby!” she squealed excitedly.
“Oh God, that thing is gonna split me in half!” I said in mock protest.
“Don’t worry,” she said soothingly, “I’ll use plenty of lube!” She grinned.
She dipped three fingers deep into the Vaseline and lathered a large amount all over her cock. Finally, she nodded and stepped up behind me. I felt her head positioned at my sphincter and a sudden stab of worry shot through me. What if it hurt too much? I didn’t have time to dwell on it. She had a crazed look in her eye.
There was no warning. One moment she was outside of me, the next she was splitting my ass open. I screamed a little louder than I meant to, and she giggled.
“Sorry baby, I’ll go slower!” she said, patting my ass cheeks as she slowly thrust into me. She stopped moving to allow me to adjust to her size. After a minute or two, she picked it back up, slowly feeding more of her monster inside me. The pain slowly faded.
It started to feel good. As she picked up speed, the pleasure elevated, her dick hitting something inside me that sent waves of pleasure through my body. Once she had a good rhythm, she stopped and laid me down on my back on the bed. She pulled my legs up to her shoulders and pushed her way back inside me, picking up her earlier rhythm.
Unmanly sounds came out of my mouth as she steadily fucked me for a solid 15 minutes.
“Oh shit, I wish I could record you moaning like a girl as I ass-fuck you!” she laughed. Finally, her moans quickened, and her movements became more frantic. “Shit! I’M GONNA CUMMMMM!” she screamed. It felt like gallons of cum flowed into my asshole.
When she finished, we collapsed onto my bed together. After about 15 minutes, I managed to get up and waddle down the hall to the bathroom. I cleaned myself up, noticing I couldn’t stop smiling. I leaned against the counter, stretching my sore legs. I wouldn’t be walking straight for a while.
Suddenly, I felt hands on my hips and a familiar cock slipping back inside my stretched asshole. I gasped in surprise and a little pain. I was sore, and this time it hurt.
“Aww, does that hurt?” she asked maniacally. “Too bad, hun, I’m fucking your ass whether you like it or not!”
She had awoken the sadistic domme inside her. I couldn’t believe how hard she was fucking me. I thought I might go through the counter. I grunted and groaned as my ass was assaulted. She brought me out into the carpeted hallway, threw me face-down, and attempted to pound me through the floor.
Finally, she came again, this time for the last time. She helped me up.
“I’m so sorry, Alex! I have no idea what came over me just now. Your ass was just so delectable I had to have it again,” she said, real concern on her face.
“It’s okay, Blair, just a little unexpected. It actually kinda turned me on to be dominated like that,” I grinned. She smiled back and gave me a huge hug.
I cleaned myself up again and slipped under the covers just as the front door opened. I heard our parents walk in. I was already asleep before they made it to the top of the stairs.
