The world ended in fire and ash three weeks ago, and all we had left was the bunker, the canned food, and each other. My sister Lena and I were both twenty-four, stuck together in that concrete hole while the radiation storms howled outside. We had always been close, but the end of everything stripped away every polite lie. The first time I caught her staring at my crotch while I changed, her eyes went dark and hungry. She didn’t look away. Neither did I.
“Fuck it,” she said one night, voice low and rough. “We’re the only ones left. No rules anymore.” She pulled her shirt off and her tits bounced free, nipples already hard. I didn’t hesitate. I grabbed her, spun her around, and bent her over the metal table. Her shorts came down in one yank.
Her pussy was already wet, glistening in the dim light of the single bulb. I spit on my cock and shoved it straight in.
Lena moaned like a filthy animal. “Yes, fuck me, brother. Wreck that cunt.” I slammed into her hard, balls slapping her ass with every thrust. The bunker echoed with the wet sounds of her pussy taking me deep. She pushed back, meeting every stroke, her juices running down her thighs. I reached around and rubbed her clit in rough circles until she came, clamping down on my cock and screaming my name.
We didn’t stop there. That first fuck turned into a marathon. I pulled out and made her suck me clean, watching her lips stretch around my shaft while she gagged and drooled. Then I flipped her onto the cot and spread her legs wide. Her pussy was puffy and red, still twitching. I ate her out like I was starving, tongue fucking her hole, sucking her clit until she squirted all over my face. She tasted like salt and desperation and pure sin.
After that we stopped pretending we were just surviving. Every day became about fucking. Morning wood meant bending her over the supply crates and pounding her from behind while she held onto the shelves. She’d beg me to cum inside her, to fill her up because “what the fuck does it matter now?” I’d unload deep, then watch my cum leak out of her swollen slit before I pushed it back in with my fingers and made her lick them clean.
Afternoons were slower but dirtier. She’d ride me on the floor, grinding her clit against my pubic bone, tits bouncing in my face. I’d suck her nipples hard while she told me how much she loved her brother’s cock, how nothing else felt this good. Sometimes she’d turn around and fuck me reverse, letting me watch her asshole wink while she took every inch. I’d slap her ass until it was bright red and she’d cum screaming.
Nights were the rawest. We’d fuck in every position we could think of. Doggy with her face pressed into the mattress. Missionary with her legs over my shoulders so I could bottom out and feel her cervix. Standing against the wall with her wrapped around me, my hands under her ass, lifting her up and down on my cock like a toy. She’d whisper the dirtiest shit: “Breed me, big brother. Knock up your sister before the world ends for real.” I’d answer by flooding her pussy again and again.
The radiation outside kept us trapped, but the hunger inside kept us busy. We stopped wearing clothes. We stopped caring about anything except the next orgasm. Lena would wake me up by sucking my cock, throat bulging while she took me to the root. I’d return the favor by eating her ass while I fingered her pussy until she shook and begged. We discovered she could squirt if I hooked my fingers just right and pounded her G-spot. The cot was always soaked.
One night the power flickered and we fucked by the glow of the emergency lights. I had her on all fours, one hand fisted in her hair, the other gripping her hip, driving into her so hard the table legs scraped the floor. She reached back and spread her ass cheeks, offering everything. “Fuck my ass too,” she growled. I spit on her hole and worked my thumb in while my cock stayed buried in her cunt. She came so hard she almost blacked out.
We kept going until we were both raw and shaking. When I finally pulled out, cum and her juices coated us both. We collapsed together, sweaty and panting, her head on my chest. Outside the bunker the world stayed dead. Inside, we stayed alive on each other’s bodies, on the filthy, endless need that the apocalypse had finally set free. No guilt. No tomorrow. Just raw, relentless incest sex until the lights went out for good.
