It is a season 2 AU in that Kurt meets Blaine but either doesn't go to Dalton or it hasn't happened yet. It's a long fic but is WIP. Blaine is basically a player and very manipulative, he has lots of conquests and drops them. The author notes said that it was Dark!Blaine. Blaine was very rich and was in control of this family's international business, bad relationship with his parents, had a godfather he was close too.
Blaine ends up falling for Kurt even though he initially just wanted to sleep with him and then dump him.
Thanks in advance.