VEC-647 Mother's Best Friend Miki Yamase

Koji has to take care of his parents while they are away on a trip. He falls in love with Miki, his mother's best friend, who came to check on him because he was worried about being alone. I want to make adult memories with Miki, no matter what. With a wicked determination, he breaks into the changing room and masturbates her underwear, but unfortunately he runs into Miki. However, instead of getting angry, Miki said,