Hearing that breathy little "just a bit" is enough to make him more determined and Bucky presses a little harder between her legs in an attempt to get her there. If it's too much, he'll back off, but he thinks she's close enough that she might need more stimulation to get there.

Maybe he's out of his mind with the need to come but he's not so bad off that he doesn't want the girl he's with to suffer for it and she makes a pretty picture, glassy eyes and soft blush. He definitely thinks he'll be finding her again, even if it's just to buy her a drink, and maybe if she's up for it they'll wind up in bed again.