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 at night, cumming inside her! He brings his friends over without permission and sexually harasses her! He's practically imprisoned and can't escape the house, and the naughty boy has become a horny monkey and keeps on chasing her, pistoning her endlessly, making her cum over and over again, even accepting a creampie!