When her pregnant daughter calls, Yuki rushes to the couple's home in Tokyo and learns she was summoned to keep her son-in-law Junya from constantly demanding sex. Her daughter has even forbidden him to masturbate. Feeling sorry for him after hearing his side, Yuki offers him a handjob—but once that restraint is gone, his pent-up lust erupts, and he repeatedly pounds her mature body with his rock-hard cock...