Not good
It's kind of weird saying the animation was bad because the whole thing was dialogue, but the way you tweened the lip sync was horrible. You used 3 different mouths to tween for the vampire, which looks REALLY bad, at least to me, and only did like 5 full seconds of fbf lip sync for the girl. I'm not saying you should do complete fbf for the lip sync, but SOME variation in the mouths would be nice instead of tweening the same poorly drawn mouth.
Concerning the rest of the animation:
For a few quick seconds you used some fbf for the girl (which was nicely done actually), but other than that the whole thing was tweened. Personally I think a few tweens here and there are fine, and sometimes completely tweened characters (kind of like madness) are okay at times, but when you use that many tweens it really looks bad.
I'm sure I had to SEE Twilight to really 'get' the parody, but the only part that was funny was the way you said 'per-FECT!'. Wow that sounded gay when I typed that. I understand if you disagree with that statement. I'll probably wish I didn't type that later on.
The voice acting was actually pretty nice, quality-wise and character-wise.
That's all I can think of right now.
I probably just over-analyzed the SHIT out of something you made as a quick side-project to get some laughs.
ANYWHO, I hope this helps you. I feel like I just typed a bunch of stuff you and everyone else already knew, though.