[ It would've been neat to turn into a horse. Aidan would probably have loved that actually but someone out there doesn't like him and so he turned into... something gross. He's not sure what yet, but it sure is gross, his skin all sickly pink and producing more slime than he knows what to do with.
Staying indoors is a no-go so instead he wanders aimlessly, eventually coming across an unfamiliar horse. No good if it escaped and since there's no one around... ]