[Bai Asuka] My Mother is My Friend's Slave [Biribiri] [Fated Circle]

A widowed mother's double life unravels when her son catches the curvy, bespectacled beauty in his own friend's grip — collared, leashed, and trained as the boy's personal pet. Behind closed doors, the classmate collects desperate housewives like Yumi, keeping them bound in stockings and lingerie for bondage and double penetration while their families wait on the other end of a ringing phone. As the son rationalizes what he witnesses, his mother sinks deeper into ahegao-eyed submission, and the real question sharpens: how many of his friends' mothers already kneel at his friend's feet?