Tony opened his mouth to command the lights, but when Steve beat him to it, he pursed his mouth together instead and shot a traitor at JARVIS mentally, to which JARVIS answered never, sir. So maybe he was possessive of his things. Especially JARVIS.

He breezed past Cap on his way to Dummy's and Butterfingers's charging stations, and then paused, and, looking over his shoulder at first honestly surprised and then honestly confused, knitted his brow. "You kept it?"