Adult PC Game: Tsumakoukan -Tanin ni Dakareru Tsuma wo Souzoushite- by TRYSET Light Archive

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 Yuji, his co-worker, about it. On the next weekend, Nobuyuki and Sanae are invited to Yuji's house and enjoy having dinner together. A while later, Nobuyuki gets drunk and falls asleep.... Just when he wakes up, he finds Erena, Yuji's wife, giving him a blowjob. According to Erena, Yuji and Sanae are having sex in a different room....