Overview

Sleeping with My Little Sister and Making Her Pregnant is a game where you can play pranks on sleeping girls (names can be changed), cum inside them, impregnate them, and make them give birth.
You can also play pranks on them when they’re awake, or have tentacles play with them (slimes are off).

This game is roughly divided into a morning part and a night part.
In the morning part, you can check the girl’s condition, learn skills, etc.
In the night part, you can play pranks on sleeping girls, and when the night part ends, a day has passed.