It did make a little bit of sense. Not that Tony would rather trade adorable smooches with Cap over anyone with a bigger cup size, but the transition between this-- Cap fixing his tie, which would have been reassuringly familiar if he hadn't put Tony on edge-- and the rude awakening felt tangibly smooth, like he could grab Rogers the same way he had Pepper that same day and balance perfectly on the line that Tony thought kept him firmly in the totally hetero bro-zone. It made him feel physically uncomfortable, but it did make sense; the familiar expression on Cap's face that was a frown line away from threatening, all that aggression built up from somewhere and so touchy about Tony's casual flirting.
The next time he saw his own Captain America was going to be a riot.
"Thanks," Tony muttered, stepping back to smooth down his tie himself and frown at the state of his suit, making an attempt at tucking his shirt back in. With a final, confused glance back Cap's way, Tony bowed his head again to slink around him and make a bolt for the door, straightening with confidence the further he got from Cap and leaving him with a cheerful, "Kisses, darling, don't wait up." He needed a drink, ASAP.