Riho is left in charge of her nephew. At first, she thinks he's just being innocently attached to her, but gradually the skinship escalates. When they take a bath together, he plays with her breasts and shows her his unconsciously erect penis! The erotic shota awakens to sex and goes even more out of control! He rubs her breasts and rapes her with a creampie at night! He brings his friends over without permission and sexually harasses her! He is practically imprisoned and unable to escape from the house, and the naughty boy, who has become a horny monkey, makes her cum over and over again with his endless piston-like thrusts, and even accepts a creampie!