Childe absolutely has a breeding kink, you just know he wants to have a whole brood of kids. Ooh predator/prey with childe??? I feel like that he would be either really obvious with it, literally chasing you down.
You feel like you're being watched, there's something or someone always in your periphery but you don't know what.
If for once he's a little more patient, stalking you and following you, wooing you. That doesn't mean he stops watching you, oh no. The sinister pleasure he would feel if you came running to him, sobbing in his arms about someone stalking you??? Oh he would just love that.
Also you can't tell me that he wouldn't take advantage of being one of the harbingers by having fatui underlings conducting surveillance on you if he has a job he can't pass off onto someone else.
he definitely sneaks into your apartment and steals your underwear
creep!childe who acts like a good guy; respecting your boundaries, taking care of you, being there when you need him. yet it's just one of his countless schemes to get you comfortable. to make you lower your guard, rely on him more and more.
he wants you to forget about everything aside from him. he wants you to live for him.
it takes a while for you to get there, but he doesn't mind snapping a few pictures of you in secret to get his fix, or sneaking some of your intimate belongings when you're not looking.