We got a bit more of background. The wife fell for the typical "I love you, I'll get to be with you once I divorce my wife" kind of player, just like that she became his side piece for years and the wife clinged to that to the point of making her daughter get the creampied by MC in a cock sucking contest because she didn't want to get fucked by her him(her husband) but the other guy. Forgot to add he told her to rim his anus and then he farted on her face lol. And he then fucked both silly and impregnated them.
By the end we get to see the wife's affair partner: Kazuhiro, the guy looks like a lazy bastard, his wife is suspicious aa he stares as his phone annoyed the MC's wife hasn't been responding to his texts.
With this release it only leaves chapter 1.5 left from all the chapters the author did so far. Now this might the the start of the revenge some people talked about before. Kazu's wife has the largest chest so far in this series.