You have anything on kurt being like a sex slave?
This isn’t a trope that I read, but here are some fics that I found for you. - HKVoyage
Consume Me Like Fire by ATruthSoLoud [PDF and EPUB]
Blaine always gets what he wants – and he wants Kurt. Kurt agrees to give himself to Blaine in exchange for his father receiving the medical treatment he needs. In Blaine’s eyes, they’re boyfriends, but Kurt sees himself as a sex slave. Mob!Blaine
Wicked Games by oprhan_account
One Shots of Mafia!Klaine, based on a GKM prompt;
Usually mafia fics where Blaine is the big bad mob boss and Kurt is the victim start with the meet and arrangement. Instead I want one where the deal is already established. Kurt has been Blaine's companion for a while now and even though it's not something he wants for himself he's come to understand worse things could have happened to him. (idk maybe he was in a bad place where he could have been tortured or in prison)
By now Kurt knows he's to wander around the house in only a shirt, preferably one of Blaine's button ups, and nothing else so he can wait for Blaine's every desire. Blaine enjoys taking Kurt wherever he can, over his desk, in the living room, in front of bound and tortured hits.
Bonus: Kurt isn't some simpering wallflower. When Blaine's new people make a comment Kurt very smoothly shuts that shit down because even as a sex slave he's got more power than any grunt worker. And Blaine lets him get away with it because he honestly has grown fond of Kurt over the years.
Tied Up Forever by gleekyxklainerx
Blaine is the Lord of the Night World, and is looking for a sex/blood slave, he finds Kurt in a club and immediately is attracted by his blood and body, he wants to take Kurt as his own, but what happens when Kurt refuses? Dark! DOM!Blaine Sex Slave, Unwilling! Kurt possible ROMANCE,BDSM and RAPE,full summary inside. WITH A SEQUEL
Other fics in this verse: Tied Up Forever:Destined For Darkness (abandoned) and Tied Up Forever: Missed Moments