Tsumugi and I have been married for a few years; she is a wife who is always devoted to her family. Today she also prepared lunch for me, and it feels as happy as being newly married. Yamashita is my junior, and I often see him staring at his phone, even while eating. It turns out he is using a dating app, targeting married women. 'Married women often feel unsatisfied with their sexual desires,' 'they are the easiest to flirt with, and the easiest to 'play' with.' I think that's just a minority; I don't believe that all women are like that, especially my wife. Yamashita said he wanted to try with my wife, and I blurted out my agreement. So I invited Yamashita over for dinner, then made an excuse to go out, leaving Yamashita alone with Tsumugi for 3 hours. When I returned, everything seemed normal, believing that nothing had happened. But since then, my wife seems to be changing more and more...