DASS-843 Mary Tachibana meets a beautiful, mature woman friend at a health club and has an affair with her.

Feeling frustrated after a fight with my wife, I head to a sex club in the afternoon, where I bump into Mary, the most beautiful mom friend in my son's class. It's awkward, but Mary gently gives me a handjob, saying, "It's our little secret." I feel guilty for having given it to her once, but the feeling of immorality that a mom friend who's even more beautiful than my wife gave it to me swirls around me. Before I knew it, I was moving towards the sex club.