Tony said
"I love you!" The words were spoken so familiarly that Steve had opened his mouth to respond before he was able to stop it. He clamped down the words and attempted to ignore the jealousy that sprang in his gut. Tony could tell his friends, especially Pepper that he loved them. He had no reason or right to get jealous. But he could not stop it. Those words were something he thought of as reserved for him.
When Tony turned to look at him, Steve forcibly smoothed out him face. He did not want Tony to know that he was jealous, it would probably annoy or anger him. Or he would laugh at Steve.
Steve said
"Say it!" The words were crooned, and Clint had a smirk on his face as he held the book out to Steve. It was signed by Steve's favorite author and is hard to get a hold of. Clint had promised to get it for Steve as long as Steve had said something to him.
Steve scowled but opened his mouth. "Thank you"
"And…"
"I love you so very much Clint." Clint flashed a look at Tony, triumphant and smug. Steve did not see it, he was too focused on flipping through the pages.
Tony froze, as a sharp heat growing in his gut. His heart throbbed with the sudden jealously that surged within him. Jealousy that he had not right to feel. It was only a joke on Clint's part and forced on Steve's.
And Steve was allowed to tell anyone he wanted that he loved him. It wasn't like the words were reserved for him…even if it felt that way.