Hinami, the mother-in-law, warmly welcomes her daughter and son-in-law who have decided to live with her. However, her son-in-law has evil feelings for Hinami's voluptuous breasts! One day, her son-in-law sees her masturbating and realizes that she is sexually frustrated. "You want to have sex, don't you?" he says, forcing her to do it, and that's the start of an affair in the home! When the family goes out, they have sex in the living room, she trains him with a vibrator while they're hanging out, she secretly serves him with a blowjob and a titty fuck through the kitchen, and when night falls, they have forbidden sex to make a baby in see-through erotic underwear! Betraying his wife and deceiving his father-in-law, the son-in-law and mother-in-law continue to devour each other today...