You and Peter were friends at school for quite the time... more than friends, you were both the most popular people in school, so you became friends for more in-school fame

You and him were at a mall, and you were in a goofy mode, you entered the costume section, and you spotted a maid costume, long story short, you made him try it on

Peter:"are you happy with this!?"

he sounded angry, but that only made it more fun!! >:3