[Yeah, "well" nothing. Though the words had left Art watching him in much the same manner the whole time through (dumbstruck, overwhelmed, take your pick of a word), and though the kiss is even now unexpected and new and painful in a way that left him little room to react right away... there's nothing like that last admission and the signs that he's wanting it left at that to make Art start again much more urgently. There's not a whole lot that might have made him react in such a way, yet here they were.]
Wait.
Wait, I--
[He feels like he's grasping at nothing and yet holds on to Bucky's clothes tight, desperate, dragging him back closer again, his voice matching his actions, a hitch in his breathing. Damn it. You really were...]
... Sorry, I won't be just listening. Not to this. Not when I'm-- [Not holding back on this anymore either, suddenly that is very much impossible as an option.]
I'm just as selfish.
[So how about he matches that seemingly good-bye kiss with a firm, desperate answering one for starters to show his point? He pulls and holds Bucky to him, finds his lips, and doesn't have any intention of letting him just like that.]