Forgive me... Impossible Sex Teaching

Yuka's husband Hiroki, thinking about quitting her job, approaches her former boss Tsuchiya to consult with her. Tsuchiya visits the house and falls in love with Yuka and approaches Yuka. The two continue to go through times of immorality that they cannot tell their husbands. Yuka falls into sex with a wild Tsuchiya that her husband doesn't have...