It’s charades night in Stark Tower.
Bucky is just out of frame, trying to get Steve to guess “50 Shades of Grey” and doing some particularly interesting moves with the metal arm. Steve suppresses laughter because he obviously knows what it is, but he wants him to keep going anyway because it’s too amusing to put an end to it, plus Tony and Rhodey have no idea what it is and they’re confused and somewhat frightened.
Clint is sulking because Natasha won’t be his partner anymore, not after the last time, when he couldn’t guess “Cat on a Hot Tin Roof.”
“What do you want me to say? You looked like you were doing bunny ears.”
“Bunnies hop, Clint.”