Shopping trip with best mate

My best mate hates shopping, but I desperately needed someone to drive me. So I persuaded him to accompany me and so that he wouldn't be so annoyed by the female shopping mania, I spontaneously pulled him into my changing room and opened his trousers. He might have looked surprised and immediately had a hard-on! In the middle of it he took out his mobile phone and filmed it because he wanted to show it off to his mates....So let him film it, I thought it was all the more cool! Unfortunately we got caught and banned from the house :(