Momotaro, who has been living in a two-household cohabitation with her daughter's couple for the past few years, has been sexless and had no other way to release her tension except through masturbation. However, one day, she is captivated by her son-in-law Kazuya's large penis. Feeling sorry for Kazuya, who is also sexless with her daughter and has no outlet for his sexual frustration, she consoles herself by thinking, "It's pitiful to be so sexually frustrated," and decides to attack him while he sleeps. Momotaro, who was already at the peak of her sexual desire, could not stop after just one time and continued to provoke and mercilessly tease Kazuya...