Bucky / Clint
There was something about seeing someone look genuinely happy to see you and Bucky didn't get a whole lot of that. He was actually more used to people looking the other way or thinking the worst about him. So to see someone he liked so much looking excited to see him gave him a rush of excitement as well. He wondered if this was what puppy love was like, or when you had a crush at a young age. He'd not really had that with Steve because by the time he realized what he was feeling he was well past that stage. So this was new, and he really liked it.
For you, he signed, about the shirt. Because you're my favorite. He moved closer to Clint and found himself still smiling. Clint wasn't wrong about crowds being a bit of a hazard for his anxiety but Bucky would navigate through that because he knew the people around were there for Clint or at least for a good time and that made it easier for him to feel settled and not nervous.
"Hate to think of how many I'll get on my next birthday," he said, raising an eyebrow. "I'm vintage, you know."