In it, Kurt breaks up with Blaine before going to New York. Afterwards Blaine and Sam become quite close. They both know they have crushes on the other when Kurt comes back and realises he made a mistake breaking upwith Blaine.
Kurt sings a broadway love song to Blaine but Blaine is oblivious and doesn't realise he is doing so, though Sam does and resigns himself to Klaine getting back together. Kurt kisses Blaine later but Blaine confesses his crush on Sam and, when Sam realises Klaine aren't dating and Blam get together.
PS: Kurt is happy for Blaine and Sam and they're all friends afterwards, this is not that fic where Kurt goes crazy and tries to break them up!
Thanks in advance if anyone knows this fic!