Emmett the Spy.

I'm looking for a fic where the gang (minus Brian) are at Deb's for dinner or a party, and Justin goes upstairs to his old bedroom and jerks off. Brian's out of town, I think, and Emmett goes up to check on Justin and ends up spying through a crack in the doorway. He likey what he sees. 

I think this has been done in a couple of different fics, so I'm not sure which one it comes from. Any suggestions?

ETA: Thank you so much [livejournal.com profile] bjshipper! It was part of Miss Miko's series Heels Over Head. Link inside.