HND-674 — My Girlfriend's Sister Loves Me So Much That We Secretly Make A Baby Together - Satori Fujinami

He takes a liking to his girlfriend's younger sister, and sneaks up on her when she's not looking to seduce her. To be honest, he's happy to be seduced by a younger sister who is cuter than his girlfriend, but... "Why can't it be me?" He demands that she make a baby with him while she's sleeping! "I'm okay with raw sex," he says, and they end up having sex again and again! He starts living together with his girlfriend at his younger sister's suggestion, but it's all her trick! He's done it raw so many times he can't count... he's worried that they'll have a baby!