Oh… crap. Uhm… I can… try? I have actually never watched any Kurtbastian fanvideos so… Ican’t really recommend any and I don’t read that much fanfictions and when I do they’re short or just one shots so… sorry.
Faking It by keepcalm90
"While out shopping one day Kurt runs into his ex Blaine and the man he left him for. Enter Sebastian Smythe a handsome onlooker who feels obligated to help Kurt out of the awkward situation by posting as his boyfriend. Now the two must keep up the act while trying to navigate their budding feeling for each other."
Marooned by keepcalm90
"Based On Blue Lagoon The Awakening: Kurt Hummel is one of the most popular kids in school. Sebastian Smythe is McKinley’s resident loner. While on a school trip to Fiji the unlike pair end up falling overboard a party boat and ultimately wash up on the shore of a deserted island. At first the tension is high but as time progresses the two find themselves growing closer."
(just read anything by keepcalm90 on ff.net. She’s really great!)
Kurtbastian One-Shots from Tumblr by fbeauchamphartz
Basically what the title says. I haven’t finished it yet because there’s more than 100 but they’re really good. She also has a part two. And she’s a great writer so I’m sure you’ll like her stuff.
And if you’re interested in one shots… or funny one shots… or smutty one shots…:
Oral Fixation by Captain Harley Quinn
"Kurt has an oral fixation. His boyfriend, Sebastian, gets tired after seeing everything else get action apart from him."
Bedtime Story by Aetheriata
"Kurt can’t sleep. Sebastian helps him out."
Property of Kurt Hummel by partitioning
"After a night of drinking, Kurt and Sebastian wake up with matching tattoos."
Curiosity, indeed by fanficloverme96
"Kurt has this little curiosity about a certain matter and he shows it to Sebastian to prove his point.Mentions and hints of voyeurism. (kitty!Kurt)"
50 Things I Despise About You by eloquentfever
"50 things Kurt Hummel hated about Sebastian, but tolerated. All dialogue."
50 Things I Hate About You by eloquentfever
"50 things Sebastian Smythe hated about Kurt Hummel, but tolerated. All dialogue. Kurtbastian. Companion piece to "50 Things I Despise About You""
Painted Lips & Dirty Knees by thedaltonwriter
"Prompt fill. AU skank!Kurt/teacher!Sebastian"
Baby You’re The Top by keepcalm90
"Part 4 in the Nerd Sebastian, Bad Boy Kurt verse. Kurt convinces Sebastian to skip school and then proceeds to gives him a day he’ll never forget."
…and that’s all I can think of right now. I can also suggest you anything by scentofsummerrain (she mostly writes klaine but she has some great Kurtbastian stories too) and… I don’t know. I FORGOT EVERYTHING I’VE EVER READ
I’m probably not very helpful so HERE's an amazing fic rec post by dannyseguel who is one of the biggest Kurtbastian shippers I know and HERE is an amazing blog dedicated just to Kurtbastian fics. You can also find a lot of great stuff HERE which is a blog dedicated to anything Kurtbastian (fanart, fanfiction, fanvideos aus…)
I’M SORRY I TRIED BUT I SUCK AND I DON’T READ ANYTHING AND I’M SORRY *hides*
ALSO SORRY THAT MOST OF IT IS ON FF.NET BUT I USUALLY READ ON MY PHONE AND FF.NET IS THE ONLY THING THAT WORKS ON MY PHONE BECAUSE I HAVE A STUPID PHONE