Adult PC Game: Tsuma no Haha no Haitoku Inkan by Appetite Archive

Kenji and Yuki are newlyweds and live with the parents of his wife Chiyako and Tadashi.
One day, when Yuki and Chiyako went to the hospital for a routine check-up, and Tadashi was at work, Kenji decided to drive the bald man.
Everything seemed to end well, but he heard footsteps. It was Chiyako ... And why did she come back earlier ?!
"Sorry, I didn't mean to disturb you."
It could still be turned into a joke, but the woman was too outraged by what she saw.
At night Kenji decided to go to the toilet. On the way, he heard strange sounds coming from Chiyako's bedroom.
Deciding to look in, he saw her masturbating. Stunned, he involuntarily leaned forward.
It's strange how things turned out. Kenji was about to apologize, but Chiyako got ahead of him.
"Kenji-kun, you can assume that we are quits and leave, but if you stay ..."
She didn’t have time to finish. Their lips merged in a passionate kiss ...

Tsuma no Haha no Haitoku Inkan by Appetite Gameplay Preview