Written for a prompt over on sherlockbbc_fic: There's a case at a secondary school/University, some series of threats or string of bizarre murders that has the entire campus shaken. In the course of the investigation, Sherlock and John meet two students. One is well liked if not popular, athletic, intelligent without showing off, involved only because they were close to a victim or witnessed something important. The other is a loner with no regard for social norms, an insufferable genius, always in the chem lab, and involved because everyone, including teachers/professors, think they're behind everything.
Sherlock and John are responsible for these two meeting. And, because they both want to help with the investigation, they get to watch them become friends and fall a little in love. And that makes them feel things about themselves that they've been working very hard to not feel, thank you.
I loved this fanfiction so much! Fiona and Sam were two very well written OC, and the case was interesting and riveting. I must say I would love more stories with Sam and Fiona solving more cases with John and Sherlock!
EDIT: I re-read this fic and I still love it so much and I wish there was a sequel with Sam and Fiona's adventures <3