Tony managed to stay away from the ex-Hydra assassin for the whole of the plane ride.
He considered it to be something of a miracle; he'd been dying to get his hands on the soldier's prosthetic arm ever since he'd first heard of it. The thought of digging into it, laying its secrets bare, made his insides quiver with anticipation.
The only thing that kept him from badgering Barnes for permission to examine it was the knowledge that Steve would kick his ass if he so much as breathed on him.
And, part of him knew, he'd deserve it.