I'd always wondered if I was satisfying my wife through sex. Perhaps because of this, the frequency of our sexual encounters had drastically decreased. My wife was too good for me. Perhaps I had a complex about feeling inferior to her. Then, I witnessed my wife's infidelity. I felt a heart-pounding rage, but more than anything, the sight of my wife happily moving her hips on top of the other man swirled within me, humiliated that I had lost to her. However, despite my feelings, my erection was so strong that it was difficult to keep my pants on. I had the urge to masturbate while watching my wife enjoying being held by another man. I actually ejaculated with one stroke, and was intoxicated by the pleasure that pierced my brain. When I held my wife for the first time in a long time, I had a flashback to that day. Overcome by a sudden surge of anger and humiliation, I held her so violently that she was surprised. However, I realized that the sensation of orgasm wasn't as strong as it had been before. Since then, I've been in contact with the other man, and he sends me embarrassing pictures of my wife, which I use to masturbate. My wife is getting more and more lewd every day, but I'm starting to feel like I'm getting used to it and won't be satisfied if things stay the way they are. I think I'll ask the other man to do something even more amazing. My wife would probably accept even perverted acts. If I saw him like that, I'm sure I'd get so hard I'd collapse. Ah, just thinking about it makes me frustrated and excited. I'll come up with a great plan after I've had a good wank. Thank you, thanks to my wife and the other man, I can indulge in some very satisfying masturbation...