Koikatsu is a hentai game where you make your waifu and can go on a date, sex, etc with her. The thing is that with some mods and patches you can do pretty much anything. Anime, cartoon, furry or realistic, break the sliders limit, etc. Sure sometimes animation don't quite work if you go too extreme (like making a girl too small and she become unable to give you a standing blowjob so the animation shows a minigirl doing the moves with the dick hanging above her head but aside of some minor issues it work even if you make a tot.