Bucky knows Steve Rogers better than he knows himself, and he can see a difference. Steve is taller, broader, but only by tiny amounts that have Bucky doubting whether what he's seeing is real, or whether his screwed up perception of reality is now altering even what his best friend looks like.

But then that button pops off.

"Did you eat peanuts again?" It's the first thing he can think of, the last time that Steve ate something he was allergic to he had swollen up to almost twice his size and ended up being able to fit into nothing of his own clothing for three days until the steroid shots properly kicked in. "...come on, come in, I'll grab you something."