**Title: Breaking the Rules**

I’d been trying not to stare at my little sister all night. But fuck, it was hard—especially when she paraded around in those tiny sleep shorts, her ass barely covered, her thighs soft and smooth under the dim bathroom light. She was bending over the sink now, brushing her teeth, the fabric riding up just enough to give me a teasing glimpse of her panties. My cock was already straining against my boxers, and I knew I couldn’t just stand there and pretend I wasn’t imagining what it’d be like to grab her hips and shove inside her.

She caught me looking in the mirror, her lips curling into a smirk around the toothbrush. “See something you like?” she murmured, slowly spitting into the sink before turning around. Her eyes dipped down to my obvious hard-on, and she didn’t even try to hide her smirk.

Fuck it. I stepped forward, my hands gripping the edge of the counter on either side of her, caging her in. “You know damn well what I see,” I growled, watching her breath hitch as my knee nudged between her thighs.

She didn’t pull away. Instead, her tongue darted out to wet her lips, her fingers coming up to trace my bare chest under my shirt. “So what are you gonna do about it?”

That was all the invitation I needed.

I grabbed the back of her neck and crushed my mouth against hers, swallowing her surprised gasp. She tasted like toothpaste and something sweet, and the way her body pressed into mine made my cock throb. My free hand slid down her side, gripping her ass hard enough to make her whimper into my mouth.

I didn’t waste time. I spun her around, bending her over the counter, her tits pressing against the cold porcelain as I yanked her shorts and panties down in one rough motion. Her pussy was already glistening, her folds swollen and pink, and I groaned at the sight.

“Fuck, you’re already wet,” I muttered, dragging my fingers through her slickness before slapping her ass hard. She yelped but arched back against me, grinding her hips like she was begging for it.

I didn’t make her wait. I undid my belt, shoving my boxers down just enough to free my cock—already leaking precum—and lined up against her entrance. With one brutal thrust, I buried myself inside her, her tight cunt clamping around me like a fucking vise.

She screamed, her nails scrabbling against the counter, but I didn’t slow down. I fucked her hard, my hips slamming into her ass with every thrust, the sound of skin slapping skin echoing off the bathroom tiles. She was so fucking tight, so hot, her walls gripping my cock like she never wanted me to leave.

“You like that?” I growled, gripping her hair and yanking her head back. “Like your big brother stretching you open?”

“Yes—fuck, yes!” she moaned, her voice breaking as I pounded into her. “Don’t stop, please—”

I didn’t. I fucked her harder, deeper, my balls slapping against her clit with every rough stroke. Her moans turned into loud, uncontrolled cries, her body trembling as she clenched around me.

“Gonna make you cum, little sis,” I snarled, slamming into her so deep I felt her cervix. “Gonna fill you up so fucking good—”

Her whole body tensed, her back arching as she came with a scream, her pussy squeezing me so tight I saw stars. I couldn’t hold back anymore. With a final thrust, I buried myself to the hilt and came hard, my cock pulsing as I shot load after load inside her.

She collapsed against the counter, panting, her legs shaking. I pulled out slowly, watching my cum drip from her well-used hole.

I smirked, slapping her ass again just to hear her gasp. “Next time, don’t tease me.”