...a girl again. So much for calling herself he now, she thought to herself. She felt happy with the idea of living as a girl again, but it felt weirdly like the boy she had been would slowly dilute away at this rate. Sure enough, Ty felt her body develop to be female, with gestational breast tissue and a vaginal slit. Her mental image of the young woman she would be at her natural age altered too, with hints of the genes Eztli gave her.
All of a sudden, she felt another presence inside the womb. There was a second fetus. It seemed to greet her in her head. "Hi, Ty," it spoke with a distinctly masculine tone to its voice.
"Wha-? Who are you?" Ty asked.
"I'm your twin, Yaotel," the other voice replied. "And unlike you, I had manhood passed onto me."
Ty still felt confused. "But... how do you exist?" she wondered.
"We both know how obsessed you are with impregnation," laughed Yaotel. "So naturally, when you and Eztli had sex on your wedding night, you made yourself ovulate so he'd knock you up again. And now you have two children growing inside you."
You wish you could say that doesn't sound like something you'd do, and eventually you sigh and admit he must be right. "So, what do you want from me, Yaotel?" you ask.
He grins evilly and then tells you...