Ootsuki Sakumi♀

Wife of Koutarou. When having sex with her husband she ask her husband question like why her father-in-law has such a muscular body to be told use to play rugby. When asked who had the bigger penis Koutarou said his father is the biggest causing Sakumi to sexually interested in her father-in-law. With Koutarou permission he allowed her to have sex with her Father-in-law despite the chances of being cuckolded. Also becomes interested in her brother-in-law due the fact he is a virgin.While her husband is gone cause her to be lonely deciding who to seduce her father-in-law or her brother-in-law.(spoiler hidden)