Man, this trope is such a weirdly specific fantasy machine, and I love-hate how predictable the mechanics can be. Usually it's this intense, undeniable pull—a 'mate bond' snapping into place the moment they lock eyes or catch the scent. The king just knows, like some cosmic checklist got ticked off. It's rarely about choice for him; destiny did the hard part.
What I find more interesting, honestly, is when the story plays with the human side not feeling it. Like in some indie-pubbed stuff, she's just trying to get through her day and this giant, growly dude is declaring her his queen because his wolf decided. The tension's better when she fights the fated mates thing, or when the 'recognition' is one-sided and he has to actually, you know, win her over. Otherwise it's just instalove with extra growling.
The scent thing is overdone, but I get why writers use it. It's a quick, visceral shortcut. Smell bypasses logic, hits the lizard brain. Still, I'd trade a hundred 'lavender and sunshine' scent descriptions for one story where the bond manifests as a shared nightmare or a compulsive need to draw the same symbol.