Porn Game: Tsuma no Haha to no Haitoku Inkan ~Okaa-san, Nyoubou to Suru yori Koufun Suru yo~ by Appetite

The protagonist Kenji and his wife Yuki met on a blind date and started dating.
While they were dating, Yuki became pregnant and they got married. Kenji is now under the care of the Honjo family and lives with his parents.

One day, Yuki and her mother-in-law, Chiyako, go to the obstetrician for a routine checkup.
Their father-in-law Tadashi is also away, leaving Kenji alone in the house. There, Kenji washes his clothes and masturbates.
Satisfied, he is about to leave when he hears a sound similar to the sound of a door opening behind him. ......
When he turned around, he saw Chiyako standing at the entrance to his room with a surprised expression.
Kenji was puzzled by the question why his mother-in-law was there. Usually at this time she had not yet returned from the hospital. ......
"God, I'm sorry. I disturbed you. ......".
Kenji regretted being seen. His wife would have laughed at this, but his mother-in-law was........

That night, Kenji woke up wanting to urinate, and as he left his room, he heard a strange voice coming from the bedroom where Chiyako was sleeping.
Worried by her voice, which sounded like she was in pain, he opened the door to his room and looked inside to find Chiyako masturbating there. ......
Kenji is stunned and he continues to stare.
When Chiyako is about to approach, he involuntarily bends over and takes a step.
Kenji apologizes to an upset Chiyako and tries to rush out of the room. Then ......

Tsuma no Haha to no Haitoku Inkan ~Okaa-san, Nyoubou to Suru yori Koufun Suru yo~ by Appetite game preview

online.