It was supposed to be a normal visit. My nineteen year old sister, Brandi, had driven up to campus to surprise me for the weekend, our parents’ idea after the divorce left the house too quiet and us too distant. We’d always been close growing up, me the older brother by two years, her the little sister who used to steal my hoodies and climb into my bed during thunderstorms. But something had changed the last year. The way her eyes lingered when I came out of the shower. The way I caught myself staring at the curve of her ass in those tiny shorts she wore around the house. Eventually, we both felt it. It started with masturbating together and then eventually we had sex for the first time. And having sex with my sister was the best sex I’d ever had.

My only complaint was that she refused to do anal. And that was a big complaint since her ass was gorgeous.

She’d just gotten here and she was in the dorm with me … fully naked.

She lay on her stomach, propped up on her elbows with her long blonde hair fanned over my pillow, scrolling aimlessly through TikTok and humming to herself. Her ass caught every glint of the ceiling light, the curve of it almost cartoonish in its perfection. She was smaller than me, only about 5’4” compared to my six feet, but her body had this tightness I was completely obsessed with. C-cup tits, perky even when she was slouching, and a slim waist that fit perfectly under my palm. Her ass, though, that’s what had been keeping me up at night for months. Round and soft, with a tiny dimple above the crack and a little mole on her right cheek. I’d never seen anything hotter in my entire life, and the fact that it belonged to my sister made the heat feel so much more forbidden.

I ogled at her for a minute, letting my eyes wander down the line of her spine to where her hips flared out, drinking in the forbidden sight. “When will you take your clothes off?” she asked while looking at her phone.

“Give me a sec.” I undressed as well, revealing my hard-on. Then I reached out, cupped one cheek, and gently squeezed it. The flesh gave under my palm like memory foam, springing back when I let go.

She glanced over her shoulder, big blue eyes lighting up with that mix of shyness and playfulness she’d had since we were kids, only now it was different. It was taboo. “Hey, hands to yourself, perv,” she said, but didn’t move away.

“You just told me to undress.”

“Yeah, it feels cozier when you’re nude with me.”

“You know I want more than nudity,” I told her.

I smirked and rolled over her, pinning her wrists above her head with one hand, my cock pressing hard against the back of her thigh. She giggled, squirming as I peppered her neck and shoulder with kisses, then nipped lightly at her ear.

She wriggled, laughing and trying to pull her arms free. “Alex, you’re such a dork,” she said. I ground my hips against her ass. She could feel me, thick and eager, and I knew she liked it when I was aggressive like this, even if she’d never admit it out loud. This is what made her wet.

I trailed my hand down her spine then down to the base where it met the soft swell of her cheeks. She had a faint tan line from her cheer uniform, the faintest blush at the top of her ass. I traced the line with my thumb, smiling when she shivered.

“Can’t help myself,” I said, voice lower than I meant it to be. “You’re literally the hottest girl I’ve ever seen.”

She rolled her eyes, but her face pinked, and she bit her lower lip. “You’re so cheesy,” she whispered. “It’s not even funny. And you’re my brother.”

The reminder should have stopped us. It didn’t. I kissed the spot right between her shoulder blades, tasting her skin. “I’m dead serious. And you love it.”

She groaned, but didn’t argue, arching her back slightly so her ass pushed up against me. The move was subtle, but I caught it.

I slid my hand between her thighs, fingers brushing her pussy. She was already wet. She moaned, burying her face in the pillow, her hips tilting up for me. My little sister, dripping for me.

I ran the head of my cock up and down her slit, just teasing the opening, then slid inside with one slow thrust. She gasped, then exhaled with a little whimper that got me right in the chest. She always felt so tight the first time I pushed in, like her body was still learning how to take me. The wrongness of it made everything sharper.

“Come on, on your knees.”

She obeyed, flashing her perfect ass to me, all mine to enjoy. I started slowly, penetrating her pink flesh and sinking deeper and deeper till the head kissed her cervix. Then I sighed in relief, feeling her wet pussy embrace my cock snugly. I pulled out and sank back in again. She moaned every time I bottomed out. Her pussy made these soft, squishy sounds, the type that would have embarrassed her if anyone else could hear, but right now she was too lost in it to care.

“God, you’re so wet,” I said. “You feel amazing.”

She giggled, face still buried. “You’re just saying that.”

“No, I mean it,” I said, picking up the pace. “You’re perfect.”

I her hips with both hands. The angle changed and I could see everything: her pale back, the bounce of her tits as she pushed up on her hands, the way my cock slid in and out, glistening with her arousal. My favorite view in the world, and it was my sister’s body taking me.

I bent over and pressed my lips to the top of her ass, then gave her a gentle slap. She squeaked in surprise.

“Alex!” she said, turning her head to glare at me, but there was a smile in her voice.

“Couldn’t resist,” I said, squeezing both cheeks in my hands.

She shook her head and pushed her hips back, grinding against me. “Just fuck me already,” she whispered, and I didn’t need to be told twice.

I started pounding harder, the slap of skin on skin echoing off the walls. She moaned louder, the sound raw and horny, and her hands clawed at the sheets. I watched the way her ass rippled every time I bottomed out, the way her pussy hugged my cock, so tight I could barely pull out.

I felt myself getting close, the pleasure building with every thrust. And it just made me fuck her harder, our flesh slapping. As I started fucking her harder, I accidentally slipped out of her pink pussy, which gaped open for a second before closing. Then the head of my cock slid up too high, glided through her slick slit, and bumped right up against the tight pink ring of her asshole. Then I pushed forward, just a little. My cock was so wet from her juices that the tip popped past the ring, and suddenly I was inside her ass … Her hole I’d dreamed of for so long.

Brandi’s whole body snapped upright, her back arching like a bow.

“Alex! That’s my ass!” she squeaked.

I was so shocked I didn’t move. The feeling was taboo, so much tighter than her pussy, like I was being strangled by a warm fist. I knew I should pull out, but it felt so damn good. All the blood had left my head. The taboo of it, the fact that this my little sister, made the tightness even more intense.

“Oh fuck, sorry, sis, I didn’t mean to,” I stammered, hands going slack on her hips. But I was still inside her, maybe two inches deep, and I could barely breathe.

She stayed perfectly still, panting hard. Her ass clenched down on me, making it even tighter. “Oh my god,” she whimpered, voice shaking. “It feels so weird… we shouldn’t.”

I started to pull out, but she reached back and grabbed my wrist, stopping me.

“Wait,” she said, eyes squeezed shut. “Just wait. Don’t move.”

I froze, afraid to make it worse. I could feel her heartbeat, every pulse squeezing my shaft. My little sister’s virgin ass gripping my cock.

“I’m so sorry,” I said again. “Do you want me to pull out?”

She nodded. “Just go really slow. I’m scared it’ll hurt if you do it fast.”

“Okay,” I said. I eased back, millimeter by millimeter, until just the head was inside her. She let out a little sigh, then bit the pillow.

“Is it okay?” I asked, barely moving.

She nodded, hair sticking to her sweaty cheek. “It’s intense. Really full. But not as bad as I thought. Don’t tell anyone. Ever.”

As If were going to tell anyone I had a sexual relationship with my sister, let alone fucked her ass. “Never,” I promised. I stayed like that, just letting her adjust. My cock throbbed, the ring of her ass gripping it so tight I thought I’d explode.

“You’re doing so good,” I said softly. “You’re amazing.”

She opened her eyes, shy and uncertain. “You can go a little deeper,” she whispered. “Just… be gentle, please. I’ve never done anal before.”

I pressed forward slowly. The pressure built, then eased as her body gave way. I was halfway in, and she whimpered, but didn’t tell me to stop. “That’s it,” I said, rubbing her back. “You’re taking it like Brandi Love.”

She giggled. “You’re such a dork.”

I held her hips and started fucking her shallowly, just enough to let her get used to it. She gripped the sheets, body shivering as I slid in and out of her ass. The sensation was mind-blowing. Her asshole was scorching hot and really tight, clenching around me deliciously. Every ridge and muscle inside her gripped my cock, squeezing as she adjusted to the intrusion. My sister … taking her big brother’s cock in her ass for the first time.

I kept fucking her gently. The initial tightness slowly gave way as her body relaxed, allowing me to sink a little deeper with each careful anal stroke.

“You’re doing so good, sis,” I murmured, rubbing her lower back soothingly as I stretched her ass. “You’re so fucking tight. It feels incredible.”

She let out a broken moan, pushing back against me just a little so her cheeks were pressed against my groin. “It’s starting to feel… good. Go on.”

Encouraged, I fucked her a bit harder, still keeping my thrusts controlled. I could see her tiny pink rosebud stretching around my thickness, the sight alone pushing me closer to the edge.

Brandi’s moans grew louder and needier. She started rocking back to meet me, her shyness melting away as pleasure took over.

“Alex… oh fuck, it’s actually feeling really good,” she moaned, her voice cracking. “Deeper… just a little. Please.”

I gave her what she asked for, thrusting deeper, my hips slapping against her soft ass cheeks. Brandi’s whole body trembled, her legs shaking as she pushed back harder. Then I buried myself as deep as I could go, my cock throbbing violently inside her tightest hole. With a deep, guttural groan, I came hard: thick, powerful ropes of cum erupting deep into her virgin ass. Pulse after pulse flooded her, filling her completely. My little sister’s ass, stuffed full of her brother’s cum.

I stayed buried inside her as we both came down, breathing hard. When I finally pulled out slowly, a thick stream of my cum immediately trickled from her slightly gaping asshole, running down over her swollen pussy lips and dripping onto the sheets.

Brandi collapsed onto her stomach, panting, then turned her head to look at me with wide, dazed eyes and a shy, surprised smile.

“I can’t believe we just did anal,” she whispered. “And… I actually liked it. This is so wrong.”

I leaned down and kissed her shoulder. “You were perfect, Brandi. And no one ever has to know.”

She buried her face in the pillow, giggling softly, half-embarrassed, half-something else. “We are so doing that again.”

I grinned, kissing the top of her head, the guilt and the heat still tangled together in my chest. “Anytime you want, baby. This stays between us.”

We lay there, tangled up in each other, the forbidden weight of what we’d just done hanging in the air between us. I knew I’d remember this night forever. And I knew we weren’t done.

UPVOTE for PART 2!

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