"You two have lost your damn fool minds," Steve said, with the certainty of a man who was watching sanity crumble right in front of his own two eyes. He said it with a fond smile though, a look that said he maybe wasn't going to join in this particular brand of nonsense, but that he was at least enjoying playing witness to the two of them making one another laugh.
Steve let out a contented sigh and settled a bit more securely into the couch cushions, his fingers idly playing with the hair at the nape of Bucky's neck. Clint's arm was warm around his shoulders, and Steve practically melted into the touch, his big body loose and lax, utterly without tension for the first time in a very, very long while. They'd been right - whatever it was that Peggy had brought Bucky, it worked fast, because this easy relaxation went far beyond a simple enjoyment of good company. Steve really did feel wonderfully, uncomplicatedly happy - there just wasn't another word for it.
"I see why you like this," Steve murmured, letting his eyes slip closed, his chest rising and falling with deep, even breaths. "This is nice, for an every once in a while kind of thing." Because there was a danger here, too, Steve was certain, and he rather thought the danger was the fact that he didn't think he could properly care about anything right now. The thought of mustering up anything close to righteous indignation was entirely beyond him, because it threatened to disrupt the bubble of bliss he was currently in. Feeling like this, Steve thought he'd be happy to spend the rest of his life curled up here on this couch, between two of his favorite people, with a fluffy black kitten crawling all over them.
Didn't sound like a terrible way to spend a lifetime.