Will it be "fated mate" instead of an attraction system?

I think it should be possible as long as one sim is a werewolf.

I read a lot of fantasy/sci-fi romance book series and where there are fated mates there are inter-occult/species fated matings more often than not. Even some vampire series have similar mechanics.

The non-were (or non-mating species, if aliens) often has the strong pull or attraction to their mate, even if they don't know the reason for it. The were (or mating species) tends to know pretty quickly, or when certain conditions are met.