Trio Search

[graciesmith]

Hello.  I'm fairly new here (in fact, I'm fairly new to the world of fanfiction), but one of the very first fics I read was a trio story that began with Ron and Hermione as an established couple.  Harry was in the boys' dorm under his invisibility cloak (I want to say he was asleep) when Ron and Hermione came in and started fooling around.  Harry couldn't think of a way to get out without them knowing he'd seen them, so he opts to stay ... and although he didn't plan to watch, you know he just had to.  Soon he finds himself finding ways to watch them and eventually they let him know they know he's watching and they ask him to join them.

I've been saving links to the stories I really liked, but I read this one before I thought to start doing that.  Does anyone know what it is and where I might find it again?