"Oh?" Tony asked, nonchalant as anything even as he gripped harder at the sink, looked into the mirror in order to make eye contact with Steve's reflection. Practically as good as the real thing, right? He smiled, charming as anything (Tony was, after all, very charming). "What do my best interests entail just this second?"
As if they didn't know. Still, Tony wouldn't have been himself if he didn't get a little bit of witty commentary in there now and again.