Hi there as I said before on my profile I'm not really good at writing stories but here my idea.

Ben get a distress call late at night and goes to help by himself but only found a strange machine that activate by a hidden enemy to send Ben to another dimension to rid him forever. When he arrive through Ben found himself lost in a strange place (Hogwarts Forbidden Forest) so he transform to see if he could find where he is. (e.g. Benwolf/ Big Chill/ Spidermonkey or Wildvine) Instead he find and save someone (e.g. Luna Lovegood or someone else) try to change back to normal only to find he can't and is stuck in that form.

Will he find a way to change back?

Will he find a way home?

Will he fall in love? (e.g. Luna Lovegood or what other Boy/Girl you chose)

That my idea the rest is up to you.

I can't wait to see them.

Good Luck