Miki catches her adult son’s friend Kosuke masturbating while staying at her house. Amused by his embarrassment, she invites him to drink and seduces him. But Kosuke’s tireless cock cannot be satisfied with a single load, and he takes her body again and again while repeatedly cumming. He begins visiting regularly so they can continue their affair, until his relentless stamina finally pushes Miki’s body to its limit.