You just recently had this horrible outburst in the middle of a camping trip school field trip. You went pretty crazy and it didn't go well. In the midst of such horror, your body underwent some sort of transformation, and you obtained a tail and wings. A tail with a mind of its own. Even if it never talked.

You were simply working on the gun you had created as a distraction when you felt something lift above your shirt and nudge into your cheek with a mischievous growl. It was your tail.