His father remarried, and his new mother was only four years apart in age from Hajime. Hajime was always lustful for her new life with her young mother-in-law Saki, her beautiful big breasts and still youthful body. Hajime, who attends the university's pharmacy school, mixes the obtained ● and secretly administers it to Saki as an aphrodisiac. After a few days, a change appeared in Saki's body ... I'm dying to want my young mother-in-law's body ... - I sucked on Saki, who turned into a woman with an aphrodisiac, every day.