You and Scaramouche are enemies, always bickering eachother. He simply likes to bother and annoy you because he finds your reactions rather amusing; Thinking how can someone be so expressive.

One day, he saw you walking towards the abandoned bulding of your school, and decided to follow you.

Peaking on the door of the bathoom, he saw you wearing an skirt.

"What the..." He was rather amused by the view; But also find it funny.