My Wife's Friend Airi Yukina

Airi Yukina is a friend of the wife, Riko, who is married to Nakamura. Nakamura fucks Airi while his wife is unaware, engaging in an act of cheating. The central kink of this movie involves the taboo and secretive nature of their affair, with Nakamura taking advantage of his wife's trust and friendship with Airi.