Say That Again, But In English This Time by janonny [15K]
Sherlock/John (explicit). First time. Partial AU. Werewolf!Sherlock. Vampire!John. Action. Casefic.
Lestrade was calling about a new murder, Sherlock was acting strange even for a consulting detective-werewolf, and John was missing blood from the fridge. Just another day in John’s life. (Alternate Universe where Sherlock is a werewolf, and John is a vampire. Everything else is exactly the same.)