Shinkon no shinshitsu: Mimodae shiiku.

Chie is an office lady who is soon to get married to her husband Akihiro, an elite man that everyone envies. However, Chie has one complaint. Ever since they started dating, Akihiro has never asked for anything more than a kiss. With no outlet for her pent-up sexual desire, Chie gets drunk one night and ends up having a relationship with a young man.