Tsuma ga Kirei ni Natta Wake - 1

The main character Hentai has been living a carefree family life for several years and does not bother him. However, in recent days, he began to notice that his dear wife had become prettier and this strange feeling of anxiety did not give him rest. He decided to hire a private detective and follow his wife. Soon, the detective brings him information about treason and incriminating evidence to his wife ...
of course, he was not satisfied with this betrayal, but the feeling that someone fucks his wife caused him exorbitant "interest ". He met his wife’s lover and agreed - he will not tell his wife about what he knows, but in replacements he will receive notes her sex with her lover ...