I really like Karofsky story line because it wasn't one of this things that was dropped and forgotten about like they usually do, it was carried on to the next season. :
Unbearable || Fanfiction Club || Niff | Glee Amino
Lima Heights Adjacent
He's So Snarky, I Love It (Sincerely, Mrs Sebastian Smythe) - ShannonCataldi - Wattpad
Barry Allen/Grant Gustin/Sebastian Smythe - IceBear180 - Wattpad
Sebastian Smythe + Kurt Hummel on Tumblr
Gay Cyclops & his Meerkat
Glee The New York Story (Fanfic) - TV Tropes
Glee:Kurt,Blaine,Sebastian Love Triangle by KlaineLuver101 on DeviantArt