Someone just walking in on the scene might think Steve had been the one suffering the cruel tickling attack, unable to hold back his laughter at Tony's bizarre escape tactics. He couldn't stop and soon it had bubbled over into near hysterics, cheeks flushed and sore as he tried to stop. He grinned fondly at the top of Tony's head before scrubbing his fingers through his hair mockingly.
"Careful," he warned, that laughter still hiding in the back of his voice.