Ashikoki Wakaoku-sama Shiboridashi Doumei

Kotaro has been spotted masturbating by his young wife Misa. There is only surprise in her eyes, but no condemnation. Since then it has become a daily routine to observe each other's play. One day a photo arrives with Kotaro masturbating. There is a threatening line on it demanding to follow Misa lead. Protagonist has to abide and follow her instructions.

[From vndbreview]