"Oh," Sam sighs, head falling to Bucky's shoulder for a moment as he's fingered open. Rocks his hips a little. Shy and tentative, but decidedly not meet and scared. He very clearly enjoys Bucky's actions.

"Like this? Can you feel it?"

He squeezes a little, just to try, gasping at his it makes those metal fingers catch in his rim beautifully.

"What else?"

Wants to know. Wants to learn. Wants to make this good enough for Bucky to be worth the risk. Wants to learn how to make it more bearable for himself in the future, too.