I do like the abductions that the night creatures perform. I think it's quite a compelling concept for a narrative.
I'd argue that's a distinct idea from the suggestion, but I think think it could be expanded to the preexisting behaviour of the night creatures.
Actually, I think it could be expanded to any intelligent creature, beyond the semi-mega beasts and night creatures.
In essence, this was more of a 'more reasons for more actors to perform more abductions' suggestion, which indeed is quite general and doubtlessly will eventuate.
Despite that, I still think it's fun to suggest.
On that note, it would be interesting to see night creatures abduct for reasons other than producing a mate. They could definitely do with a few housekeepers to sweep up and keep the cauldron boiling. Maybe a few plump children caged up for supper.
I'm uncertain if necromancers currently abduct people. I vaguely recall something about experimentation and minions. Maybe that was corpses only. I don't know if that means they abduct a single person, experiment once, and then gain the ability to summon these minions, or if it's a 1:1 conversion. I'd hope it was the latter as it'd mean more interaction with the environment.
Of course, cultists, demons and vampires should perhaps abduct for sacrifice and torture and the like, but that seems far more sinister than the fairy tale-esque motives above. Especially as it doesn't leave much room for follow-up, such as a rescue, etc.