"I didn't say I didn't want to do it," Peter said quickly, confused, trying to reassure Tony he hadn't mean to say or imply or infer that he didn't want to be his best man. He'd just been surprised. Of all the people to pick, Peter never would have thought of himself as best man material. They were always older guys the groom was friends with, right? That's who they were in movies at least. And that was about the end and beginning of his knowledge about best men -- movie references. But he did know it was a big deal, and he didn't want Tony thinking he didn't want to or something, even if Pepper wasn't there.
"I don't know anything about being a best man," he continued. "But that doesn't mean I wouldn't want to be your best man. I would. I do! I mean, if Pepper comes back, and if you guys plan your wedding, and you still want me to be," because he knew there were others here, especially with Colonel Rhodes there, "I'd like to." And he meant it. And he did hope Pepper came back. Some people seemed to, so there was always hope she'd return.
"You just may have to tell me what a best man does, or I'll end up looking it up on the internet," he added, his tone joking though his face was sincere. He really did mean what he said about wanting to be Tony's best man if the man still wanted him to be should Pepper return.