Hey, I stumbled across one of these if you're still interested: The thing is (http://archiveofourown.org/works/4788464) by curiousbees. Apparently I should have added "poly relationship where Steve and Bucky are queerplatonic but cool with sharing" to the list.
Also meant to say, I read "Gift with Remix" and quite enjoyed it, thanks! Although you made me nervous--you said he pretended to be Steve's boyfriend to "get rid of" Tony, and when I saw how well Tony and Steve were getting along, I worried that he'd be pulling a jerk move... but pretending to be Steve's boyfriend in order to goad Tony into showing his true feelings, that was totally fine. :-)
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Also meant to say, I read "Gift with Remix" and quite enjoyed it, thanks! Although you made me nervous--you said he pretended to be Steve's boyfriend to "get rid of" Tony, and when I saw how well Tony and Steve were getting along, I worried that he'd be pulling a jerk move... but pretending to be Steve's boyfriend in order to goad Tony into showing his true feelings, that was totally fine. :-)