While looking for a bathroom, he accidentally sees his girlfriend's mother changing clothes. His curiosity and lust make him stop and watch for a long time. When her mother finishes changing, he sneaks into the room and takes the underwear that was just changed and is still warm from her body to masturbate.
When he is discovered, he is scared, but unexpectedly, instead of scolding her, her girlfriend's mother is gentle because it has been a long time since she had sex with a young man. After that, what happened happened and the two had a secret happy time without anyone knowing.
