Eager was almost an understatement, Steve wanted to touch him, taste him, feel him everywhere all at once. He wanted to have Tony in ways that should have scared him, but he was done being afraid. His reaction made it clear that the touch was welcome and Steve felt his cheeks practically burn over his own forwardness.
He laughed low and warm, which he needed his tongue back in his head to do. But when he was done it was back to working it in alongside his fingers in what he hoped was a pleasant distraction from how he stretched him open. Steve loved the hand in his hair, like the way he touched him made Tony need something to hold onto and he groaned as he rubbed his beard against the sensitive skin of his inner thigh.
It wasn't something he'd done before, but with Tony he wanted to and it wasn't hard, a pretty easy concept really. "That's it, sweetheart. You're perfect," he said as he looked up into his eyes.