Orcsoft - Aisai Nikki

A young woman has needs. But she would never betray her husband...Keisuke loved his wife Sanae with all his heart. She loved him too. They had a sexless life because of his erectile dysfunction. To satisfy her needs as a woman, he enlisted the help of Ryouichi, thinking only about her sexual well-being. Surely she would enjoy the sex, but not give her heart or true love to another man...
Soon paranoid, he filmed Sanae during her sexual encounters. And what he saw...