My beloved wife had sex with a colleague in front of me, and for some reason, my penis became erect. (Kana Morisawa ADN-557)

I married my wife after a workplace romance. We didn't want children, but I suffer from erectile dysfunction… After discussing it with my wife, she also decided against having children, but I didn't want any either… One day, I was drinking with my boss, Hashimoto, and I got drunk early on. When I woke up, I found my wife and Hashimoto making love. This sudden turn of events shocked, angered, and saddened me, but then I discovered I had a long-lost erection.