Touka, a housewife living with her husband and daughter-in-law as a couple of four. Having given birth to a daughter in her teens and being busy raising her, she had become distant from her husband's nightly affairs. However, Touka's surplus body strongly attracted her son-in-law, Kohhei! Her beauty was unimaginable for a mother-in-law, and her disgusting huge breasts... Living close to Touka, Kohhei's reason eventually collapsed, and he forcibly committed adultery within the household! 'That person... that child is here, so no...!' While Touka verbally rejected him, she gradually became satisfied by her son-in-law's strong sexual desire.
