Yui lives a happy married life, but one day she begins a forbidden relationship with her husband's stepson, becoming completely captivated by his young body. One day, her husband goes on a two-day, one-night business trip, and when her son wakes up in the morning, she seduces him by touching his crotch, giving him a titjob and a blowjob, and he cums in her mouth! His erection still won't go down, so she invites him into the living room for sex. After that, they continue to have sex anytime, anywhere - during dinner, in the bath, and in the couple's bedroom - and when her husband comes home, she ties him up and has sex with him right in front of him. Excited by the sight, Yui finds his erect penis and licks it while he fucks her doggystyle. It's a two-day seduction-filled sex feast!