Tsuma Koukan ~Tanin ni Dakareru Tsuma o Souzou Shite~

Nobuyuki is a white-collor worker. He got married to Sanae three years ago. She is quiet, but a good wife. They seem to have a happy life.... But there is one thing Nobuyuki concerns. Sanae persistently asks for sex recently. One day, he talks Yuuji, his co-worker, about it. On the next weekend, Nobuyuki and Sanae are invited to Yuuji's house and enjoy having dinner together. A while later, Nobuyuki gets drunk and falls asleep.... Just when he wakes up, he finds Erena, Yuuji's wife, giving him a blowjob. According to Erena, Yuuji and Sanae are having sex in a different room....