I know there's RTA fic in general on fanfiction.net (the lot of which is Gus/Felicity with a little Felix/Izzy sprinkled in there), along with some stories on the Sullivan forums, and I have a few posted on my own RTA site (some of which are also on ff.net). But yeah; most RTA fic is Gus/Felicity-centric, a little is Felix/Izzy-centric, and there are some ensemble ones. But I've not seen anything focused on Alec/Janet until now.