Aisuru tsuma, Mariko no furin houkoku

The main character "Yasu Sashihara" and the heroine "Mariko
Sashihara" are a married couple in their fifth year of marriage. When he was
newly married, his wife's affair was discovered only once, but it didn't
matter and he lived a peaceful couple life. However, recently, the two have
been worried that the couple's activities have become light nights. One day,
Yasushi receives a post facto report of cheating sex from his wife Mariko.
・ The partner is a new employee 8 years younger and a virgin boy.
・ Being a sportsman who was a long-distance runner when he was a student.
・ Being confessed after having sex at a love hotel.
Mariko said she wanted to be her husband's official lover. It was a messy
request, but it was different for Yasushi who had a desire to be cuckold.
Intense excitement she hadn't felt for a long time. Yasu accepted Mariko's
desire and started an affair dating officially recognized by her husband ...