As soon as the soldier's elbows locked up Tony moved. Swiftly unfolding his legs and stretching them out under his partner.
“Tony, what are you–”
Tony ignored him, lying down fully and shimmying his way under Steve the same way he would a car he was working on. He shifted and squirmed a little, finally settling and smirking up at the other man. Steve hadn't broken form and was staring down at him with wide slightly confused eyes.
“Continue,” Tony said as if it were obvious.
(Or, Tony is horny and tired of waiting for Steve to finish working out.)