In a way, Bucky kind of was testing the waters. Things like that had come pretty easily between him and Steve when they were growing up together. It wasn't really even a question. He'd been playful with the Howlies when they had downtime between missions. If he could strike up some sort of companionship with Clint, it wouldn't be a bad thing. Though he'd sort of gotten used to being alone, that didn't mean he liked it, and he couldn't depend on Steve all the time (even if Steve insisted that he could). Someone he could dick around with and didn't have any ties to the past? Honestly that sounded pretty great.
He wouldn't get ahead of himself, though. One entertaining outing where they found lewd drawings of each other wasn't a solidifying experience that bonded them for life. ...Granted, it was a unique experience and therefore did give them some grounds for the beginning of something. It was a start, and he'd take it.
"I guess I have to respect that you're owning the hell out of it," he said, deadpan. "I can only aspire to that sort of greatness. Maybe one day I can embrace the centaur within." Yeah, no, that wasn't ever going to happen but he at least might ascend to being able to look at it without cringing whenever he went to the coffee shop in the future. Because yeah, he'd probably go now that he knew who Clint was.