The kiss tempered Tony's urgency, stilling his restless hands as long as Steve had that sharp hold on his hair then drawing them up to Steve's cheeks and around his neck as Tony settled against the counter between Steve's thighs to coax his kiss deeper. Not that Tony would say anything like it reassured or relieved him, but 'if' they were not quote-unquote 'together' in the near and/or distant future, and Tony's otherwise altogether disappointing contribution to what 'together' had thus far meant, with or without flash, lead Steve to lose interest in persuing any other facets of an amiable relationship, as in romantic or platonic or a stable and reliable battlefield 'brotherhood' in his words, not Tony's, but in Steve's eyes, that was 'if' Tony was seeing the last of all of that then this kiss had to mean this part might be a more difficult code to crack. If nothing else, Steve might still let Tony kiss him like that.
With a stuttered hitch in his breath, Tony blinked his eyes open, focused, and smoothed his thumb across Steve's cheekbone with a last kiss to his bruised lips. He was supposed to be proving himself irreplaceable here. He dropped one hand again, spreading the other between Steve's broad shoulders as he stroked Steve in a loose fist and breathed, "You're right, this is a disaster."