Brian's twin I've come across a lot of fics in which Brian meets long-lost family members who are a vast improvement on the horrid family canon gave him. (I'm particularly fond of Morpheus's "long-lost father" story,
Dark Roots.) At least two of them (that I've read) involve Brian having a twin brother from whom he was separated at birth.
I looked for them again but could only find one:
Brother's Heels by Starlightbj. I'd like to find and reread the other. Does anyone know of another "Brian's long-lost twin brother" fic and where to find it?
Update: many recs in the comments