This is my very first post, so I apologize if I make any silly mistakes.
I have two specific searches for semi long Klaine fics I've somehow lost.
The first is a future AU where Kurt and Blaine are married and adopting a child. They find a willing mom and they adopt her child, but a few days later she changes her mind. Kurt and Blaine are devastated and if I recall correctly, Kurt develops an eating disorder. I also think Blaine begins to harm himself. I don't really recall how it ends or if it was even completed, but I think they adopted again and it worked out.
The second is an AU where Blaine goes to McKinley and is very mysterious. He doesnt talk to anyone except for Santana, who is his best friend. Kurt and Blaine get paired together for a project, I think, and then Kurt becomes closer with him until he finds out Blaine has a sister. I think the reason Blaine was so shy was because his sister had an accident or something that he blamed himself for.