2 Works in Natasha Romanov/Tony Stark/Thor
There are fifteen unique pairings among the core Avengers.
What follows are snippets of all of them. (Plus a few OT3s for good measure.)
Fill for a prompt on the avengerskinkmeme: Tony is the Avengers' sub and omega. He may snark all he wants, but at the end of the day, he's happy to get down on his knees and please his masters and mistress.