He absolutely remembered. He constantly thought of that night, finally getting to be inside his freshly-graduated little sister after so many years of shamefully wanting her. He had felt his orgasm coming, looked down at the naked girl under him, cheeks flushed and eyes closed, gripping the pillow and letting out the most delicious, perverse gasps and pants and moans as he filled her.
How could he resist? He needed to watch his taboo baby swell her, needed to see her sobbing and whimpering and leading in labor, as she gave birth. Watch that cute slit bulge and part around the head of her own niece or nephew.
Knowing her boyfriend had just proposed only made it better. A quick, secret pity fuck risking turning into a lifelong secret shame... He didn't even try to resist, even pushed it a bit, feeling his sperm throbbing deep into his little sister.
She still hadn't even fucked her fiance. It couldn't be his, or anyone else's. Looking at her, belly swollen, anger and disbelief on her face... She'd just taken a pregnancy test with him in the other room. Today was the day she found out her own brother had gotten her pregnant.
Their parents would be furious, probably disown them for doing something so disgusting with one another. Her fiance would leave her, not having any pity for how wrong this was, how scared she was, how wrong it felt to know an inbred baby was coming to life inside her, one she hadn't wanted to conceive.
So it stayed their secret. The two worked together to hide it, their grotesque, shameful secret that nobody else could know about. In the end, it was everything he'd hoped for. She was insatiable because of her pregnancy, and they cheated on her fiance several more times, him getting to drink in every inch of her changing, fertile body. Feeling his incest baby kicking inside her belly as she neared orgasm.
Best of all, she hid in his house as she labored, her wedding days away. It took longer than she thought. He kept a timer, in secret, as she felt the urge to push. He watched his little sister, the girl he'd watched grow up, had protected from bullies and supported as she struggled with homework, face reddening as she bore down, sobbing for this inbred baby to get out, just please get out, that she didn't want it, that this wasn't how it was supposed to be.
He could just see the head of his little life ruiner emerging from his sibling when the timer beeped. "What was that?" She panted between contractions. Her brother reached down, playing with her opening, touching the head of his baby. "Your wedding just started. You're supposed to be walking down the aisle right now. Looking forward to spending your life with your boyfriend. And instead, here you are, in secret, birthing your big brother's baby as he watches. It's over, hon. He's not going to stay after this. Now push. Push and think about how angry and betrayed he must feel, our inbred affair baby coming out of you..."
She screamed. Agony, both emotional and physical clear in her voice as she gave everything to childbirth. Slowly, her brother got everything he wanted, moaning with pure delight as she delivered his taboo burden directly into his hands...
