NSFS-204 A gift for a grown son

After his father passed away, he lived with his mother and son. The three of them lived on the second floor of the landlord's house. One day, my son found a hole in the wardrobe. When I looked through the hole, my mother, Hanakiyo, and the landlord were having sex. Seeing his mother being carried made him feel jealous for some reason and view his mother as a woman. And...