I was twenty-two when it happened, home from college for the summer, sharing the old bedroom with my older brother Jake who was twenty-five and still living at home while he figured out his next move. We'd always been close, but that night after our parents went to bed early, we got to drinking in the room, talking shit about girls and life. Jake was bigger than me, all muscle from construction work, and when he stripped down to his boxers to get comfortable, I couldn't stop staring at the thick bulge pushing against the fabric.
"Fuck, little bro, you keep looking," he said, voice low and rough. He grabbed his cock through the boxers and squeezed. "You curious or what?"
I laughed it off at first, but my own dick was getting hard fast. "Shut up, man. It's just weird seeing you like this."
Jake stood up, dropped his boxers, and let his fat cock swing free. It was already half-hard, veined and heavy, the head glistening a little. "Come on, touch it. You know you want to. First time for everything."
My heart pounded as I reached out. His cock was hot and thick in my hand, bigger than mine, and when I stroked it once, Jake groaned deep. "Yeah, just like that. Grip it tighter." I pumped him slow at first, watching the skin slide over the head, precum leaking out onto my fingers. It felt wrong and so fucking good at the same time.
Jake pushed me back on the bed and yanked my shorts off. My cock sprang up, and he wrapped his rough hand around it without hesitation. "Damn, you're leaking already. You like your big brother's dick, don't you?" He stroked me fast and dirty, thumb rubbing over the slit, while I kept jerking him. We were both breathing hard, hips bucking into each other's fists.
He climbed on top, our cocks rubbing together, hot and slick. "Open your mouth," he ordered. I did, and he fed me the head of his cock. It tasted salty and male, stretching my lips wide. I sucked like I'd seen in porn, tongue swirling, taking more until it hit the back of my throat. Jake fucked my mouth slow and steady, hands in my hair. "That's it, suck your brother's cock. First time and you're already a natural slut for it."
I gagged but didn't stop, drool running down my chin as he pushed deeper. My own dick throbbed untouched, aching. Jake pulled out, flipped me over onto my stomach, and spread my ass cheeks. "Look at this tight hole. Never been fucked, huh?" His finger rubbed over my entrance, then pushed in dry. I gasped at the burn, but he worked it in and out, adding spit until I was loose enough for two fingers.
He lined up his cock and pressed the head against my hole. "Relax, little bro. Gonna fill you up." The stretch was intense as he pushed in, inch by thick inch, until his balls pressed against me. It hurt at first, but then he started thrusting, hitting something inside that made me moan into the pillow. Jake fucked me raw and deep, grunting with each stroke, calling me his dirty little brother while he pounded my ass.
I came first, untouched, shooting ropes across the sheets as his cock hammered my prostate. Jake followed soon after, burying himself balls-deep and flooding my hole with hot cum.

He stayed inside me, grinding slow until he softened, then pulled out and watched his load drip out of my used hole.
We didn't talk much after, just cleaned up and went to sleep, but the next night we did it again. And again. That first time turned into regular raw sessions whenever we could get alone, me taking his cock in my mouth or ass, sometimes riding him while he called me names that made me harder than anything. It was filthy, secret, and exactly what we both needed.