not sure at the moment, but the next one will not be the last!
make more till it eventually gets to the point Treat dies of natural causes... then continue it again with the most cliche but nonetheless enjoyable way by making "Treat #2" that features Treat's kid instead along with others... ya can't end something when you can't stop them from reproducing.
Well... I guess there is a witch town literally next door.
I'm sure they could find out something.