Need to Know Basis

Summary: Steve completely respects the very modern, gay relationship that Phil Coulson and Clint Barton share. He's good friends with Barton and he admires Coulson, so there is absolutely nothing about their love for each other that bothers Steve, not one bit. At all. ...except for the small, inconsequential fact that Steve is falling in love with Phil. (Or, the one where Steve assumes and Clint assumes and Phil assumes and they're all wrong to some degree about what exactly is the topic of conversation, and the misunderstanding continues to grow.)