Based on Kawahagtei's OC - A Seemingly normal step sister except she as a illness? that can only be cured by becoming pregnant?! Expect lots of cum inflation, breeding and dirt talk.
Breasts are growing wombs Inspired by one of the endings in the adult visual novel "Holstein Girls" https://cowgirldev.itch.io/holstein-girls
You found out that your haughty boss secretly has an impregnation fetish. Inspired by https://nhentai.net/g/462301/