START-098 A story about how I succumbed to the unconscious temptation of my girlfriend's busty sister who is very interested in sex and ended up being NTR'd - Nanase Aoi

Nanase, who moved to Tokyo from her hometown of Okayama to attend university, had housing trouble and ended up staying in the apartment where her sister lives with her boyfriend. Having left her parents and become curious about many things, Nanase ends up becoming interested in her sister's boyfriend, Yuta... Cute, big tits, no bra! A dreamlike story of being cuckolded by your girlfriend's increasingly erotic younger sister!