Fun fact, exorcisms are still preformed today - not widely, but there are still some priests who get like Vatican certified to perform exorcisms. To the priests' credit, 99% of the time they'll see the person they're supposed to be exorcising and the behaviors they're exhibiting and tell the person's family "yeah your loved one has epilepsy/some other neurological disorder, they need a doctor not an exorcist" and no exorcism will happen.

All this to say, Youth Pastor Craig is expecting a quick and uneventful trip when Mr. and Mrs. Tweak call asking for an exorcism for their son. Probably just an unruly teenager at best, someone having seizures at worse. He's not expecting a cute twitchy blonde his age tied to a bed, he's not expecting to be flirted with the whole time, and he's really not expecting Tweak to actually be possessed by an Imp.

(Please note, fucking is not a Vatican approved exorcism method, but desperate times call for desperate measures and whatnot)