I never meant for it to happen. That’s the first thing I tell myself every morning when I wake up and feel the round swell of my belly pressing against the sheets. But the truth is, I wanted it. I wanted him. My brother. And now I’m carrying his child, our secret growing inside me with every heartbeat.
It started the summer after Mom and Dad moved to the coast, leaving the old house to us while we figured out our lives. I was twenty-three, fresh out of college and drifting. He was twenty-five, already working construction, all broad shoulders and callused hands. We’d always been close, but that summer the house felt too empty, too quiet. One night after too much wine we sat on the back porch and he looked at me differently. His eyes lingered on the way my tank top clung to my breasts. I didn’t pull away when his hand brushed my thigh.
The first time was raw and sudden. We were in the kitchen, arguing about nothing, and suddenly his mouth was on mine. I tasted salt and beer and something I’d been starving for without knowing it. He lifted me onto the counter, yanked my shorts down, and pushed inside me before I could think. It was fast, desperate, his cock stretching me open while I clutched his back and whispered his name like a prayer. He came deep, flooding me, and I felt every pulse. We didn’t talk about it afterward. We just went to our separate rooms, but I lay awake feeling his cum leak out of me, already wondering when it would happen again.
It happened again the next night.
And the night after. We stopped pretending it was an accident. He’d come into my room after midnight, strip me slowly, and fuck me until I was shaking. Sometimes he was gentle, kissing the inside of my thighs before sliding his tongue over my clit until I begged. Other times he bent me over the bed and took me hard, one hand gripping my hair, the other slapping my ass while he growled how tight I was, how I was made for his cock. I learned to love the dirty things he said. “You’re my little sister and you’re going to take every drop,” he’d grunt, and I’d come so hard my legs gave out.
We never used protection. At first it was just heat and carelessness. Then it became something darker and sweeter. I started tracking my cycle, telling him when I was fertile. The nights he knew I could get pregnant he’d fuck me slower, deeper, holding still at the end so his cum had nowhere to go but inside my womb. I’d lie there afterward with my hips tilted up, feeling it work its way deeper, imagining his seed taking root.
By the third month I knew. The test turned positive on a Tuesday morning. I showed it to him in the hallway. He stared at the two lines, then at my still-flat stomach, and something shifted in his eyes. He dropped to his knees right there, pulled my leggings down, and buried his face between my legs. He licked me until I came on his tongue, then stood, turned me around, and fucked me against the wall while whispering that I was his now, that the baby growing inside me proved it. I came again when he did, clenching around him as he pumped another load into me.
Pregnancy changed everything. My breasts grew tender and heavy. He couldn’t keep his hands off them, sucking my nipples until milk started to bead, even before the baby came. My belly rounded slowly, and he loved to fuck me from behind so he could reach around and cradle the swell while he thrust. “Look at you,” he’d say, voice rough. “My sister, knocked up with my kid. So fucking beautiful.” The words made me wetter every time.
We got bolder. He’d take me in the middle of the day on the living room couch, sunlight streaming across my bare skin. I’d ride him slowly, my hands on his chest, my belly between us, feeling his cock nudge deeper with every roll of my hips. Sometimes he’d pull out and come on my stomach, rubbing it into my skin like lotion, then push back inside to finish. Other times he’d stay buried until the last drop, making sure nothing was wasted.
The cravings were intense. Not just for food, but for him. I’d wake him at 3 a.m. needing his mouth or his cock. He always gave it to me. One night, seven months along, I straddled him and sank down until he was fully seated. My belly rested on his abs as I rocked. He reached up and thumbed my swollen nipples, watching milk bead and drip onto his chest. “You’re so full,” he murmured. “Full of my baby, full of my cum.” I came shaking, and he followed, pulsing hot inside me again.
We don’t talk about the future much. We know we can’t stay here forever, but for now this is ours. The house, the secret, the life we made together. Every kick from the baby reminds me how deep this goes. When he touches my belly now it’s both tender and possessive. He still fucks me every night, careful but hungry, whispering that he’ll put another one in me as soon as this one is born.
I used to feel guilty. Now I just feel full. Full of him, full of our child, full of a desire I never want to end. When I lie in bed at night with his arm around me and his hand resting on the curve of my stomach, I know this is what I was always meant for. His sister. His lover. The mother of his children. And every time he slides inside me again, I welcome him home.
