I've actually been r*ped by my husband's boss (2014)

Manager Kaneko has been ogling the voluptuous body of his subordinate's wife, Hana, with a wicked eye. Kaneko pretends to be sick to get Hana to come and take care of him, and then he finally violates Hana to his heart's content! Then, hiding from his subordinates, he begins to train Hana. Hana resists strongly, but gradually succumbs to Kaneko's relentless caresses. Hana's dormant desires are awakened...