Kurt is bit by a werewolf in the park and when he wakes up he's in a hospital tied to the bed and Blaine's father is telling him that he's a werewolf now. But they're really shocked that Kurt is an Omega wolf because infected were's never are. Blaine takes Kurt under his wing and eventually he tries to develop a relationship with him but Blaine's father forbids it to keep Blaine safe.
I know that Kurt had a room mate that called him a bitch and picked on him for being an Omega. And Blaine had at least two older brothers who are much bigger and stronger than him. I think one is named Nathanial. His mother is short and blond.
It may be in the second fic but I know they go to a big pack meet and Kurt meets a gay Russian wolf that wants to mate with him but Blaine and his family are against it because the Russian guy would probably treat Kurt like a pet.