Near dark?
Nope, but in the right vicinity.
Lost Boys?
Nope, not that one.
American werewolf in Paris?
Nope. You guys need to think cheesier.
Teen Wolf?
Jenniferās Body?
Ginger Snaps?
This is the closest in tone so far.
Lost boys?
Couple of wild stabs in the dark in two different directions: X-Men or Species?
Back to the Future?? (with teen first-time time travelling, that is)
The fly???
Boy overcomes all, pet sister is motivation
None of the guesses so far are correct. So, hint:
Teenās new lifestyle begins friendship with butcher
Twilight? (padding)
Never seen it, so I wouldnāt know. Not what I have in mind, in any case.
Neither have I, but assume her āfirst timeā was pretty life-changing, and that he qualifies as a butcher. I could be wrong on both counts, and in any case, not on track.
That sounds like it could be The Professional, but the first clue not so much.