Creepy 18 year-old with a Diaper Fetish

A boy from my school had been “Prank Calling” me, saying he was wearing Pull-ups and wanted me to change him. I never answered the calls, as they happened multiple times every day. But one night, out of boredom and curiosity, I decided to stay on the phone with the caller and trick him into telling me his identity. This is half of our phone conversation (With vulgar parts cut out) AFTER he already told me who he was. This guy is sick, and creepy.