My girlfriend's younger sister is a cheap, quick-to-orgasm girl with a small, weak vagina. (Aoi Mizuho, SAN-310)

Mizuho was seduced by her sister's boyfriend and started a flirtatious relationship with him. Moreover, she's a slut who orgasms easily with just a little play. She was penetrated by two men and became pregnant, not knowing who the father was. However, she still craves penises every day.