1. A WIP from last fall that was updated at least as recently as February-ish, hosted on ff.net. Karofsky attacked and seriously injured and I think also sexually assaulted Kurt, and Blaine knew who was responsible and they had a big fight while Blaine was trying to coerce Kurt into telling his dad what had happened. There were also cute scenes with Blaine's family over at the Hudmels' for Christmas, and I remember Blaine had an older sister named Francie (after "Baby" in Dirty Dancing). Found in comments
2. A smutfic with cat-in-heat!Kurt, but not the one where he has actual kittens (that one I can find). This one involved the idea that Burt had told Blaine he essentially wasn't allowed to have sex with Kurt when he was in-heat because he wasn't really capable of giving consent, but I don't remember much beyond that Found in comments
Thanks in advance!