Thanks! It's one of my favorite threesomes as well; I was originally intending to sign up for Beltane just because I had the urge to write them together, but then Djin let me know there would be a menage a trois prompt this year, so I decided to wait for it.
I'm really glad Draco as mediator came through well! That was one of my touchstones for the fic; I really wanted Snape and Harry to have some issues communicating, with Draco providing common ground and a bit o snarky commentary.