After school, I was in the private bathroom as usual when someone knocked on the door persistently! There was a girl in bloomers fidgeting! Immediately after, the girl couldn't hold it in and peed in front of me! I was aroused by the sight and got an erection, and she pulled down my pants and said, "You'll be embarrassed too!" The girl was confused by the erect penis in front of her, but slowly reached out her hand...