Have you read my Threesomeverse? I don't remember seeing your name in my comments. It's not *exactly* what you're looking for--there's a little bit of H/W envy, but it's not the central emotional theme--but you might like it anyway. Go to my LJ and click on the "threesome" tag.

It would be nice if there was a story that matches your criteria more exactly--I'd like to read it too!