The man’s wife gets ntr’d and so he lives with his mother-in-law and sister-in-law. They both think the wife is stupid for letting him go and console him with lots of sex. Turns out, he’s really good at it. It’s just that he was really focused on his career and the wife was feeling neglected and cheated on him. So he stops holding back. They do it over and over again together and at the end I think they both get pregnant. I think the wife feels regret and tries to get him back but her mother and sister essentially tell her “too bad, so sad.”
It is not either of the two below:
[Emori Uki] I Married Into a Wealthy Family <500794>
yasashii dake no otoko to tsuma ni sute raretsnode
https://nhentai.net/g/593456/