Put a bun in the oven

"Oooohhhh I want it in me!! I want all your cum in meeeeee!!"

I shivered as I orgasmed again, pushing my hips back to compensate for Greg's slowed thrusts.

"Mmm as you wish my dear sister."

Greg took hold of my hair and wrenched my head back as he began violently slamming his cock in me again. I couldn't speak; I could barely even moan from the intense fucking I was getting. I drooled, my eyes rolling up again as my brother fucked my brains out. He bottomed out in my pussy and I groaned as the first shot of warm cum invaded my womb. It was like a fire hose as rope after rope of hot seed shot into me. I felt myself getting full as my stomach expanded outward. Greg pulled out, his cock still spurting jizz which covered my ass. He let go of my hair and hips and I sank to the floor, my butt raised in the air. My head felt so empty and I just kept giggling as the wet sensation of Greg's cum dripping from my pussy down my thigh made me horny all over again. Mommy dropped down and began to lap at the cum on my ass, her hands sinking into the soft flesh. My own hands grasped my swollen belly and I knew that I was going to be a mommy too. I gasped as a tongue worked itself into my folds, scooping out what cum was still available. Greg stood over mommy and me, slowly stroking his still-hard member while he observed us.

"This has been one hell of a birthday."

He muttered, his eyes drifting from my visibly pregnant stomach up to my titties, which were still squished out on the floor beneath me. I shivered as I came from mommy's tongue, and from the sensation of a cold wetness on my nipples. I was leaking milk again: I could feel the weight in my tits and the puddle that had started to form under them. I had always been rather milky, quite often I'd have to spend a few hours every day draining them. Most times Greg or mommy would latch onto my nipple and help me, nursing my cream. When they weren't available I'd do it myself. There was something extremely erotic about drinking your own tittie milk, especially straight from the source. And now that I was pregnant, I'd soon have another person to help milk me.
Mommy let go of my fat butt and we both stood up. Greg's cum still dripped out of me, and with me still being horny and my overflowing tits, I was a wet mess. Mommy still had Daddy stuffed in her, and with the long dildo sticking out it also looked like she has a cock, which made me giggle. I liked cocks, Greg's most of all, and I also liked how he continuously checked me out. I shivered yet again under his gaze. It made me feel hot and horny and dumb and slutty.
I'm so happy that I'm, like, his little breeding cow!