Tony's jaw actually drops. And as much as he'll deny it later, his hands cover up the reactor like a woman might cover her breasts. It's different, though, because while in Tony's opinion breasts are great, the arc reactor is most definitely not.

The familiarity of the golden fixtures, the marble tub, the cool colored red of the walls and brightness of the lights make him manage not to panic entirely. The key word is entirely. He bites his lip, looking away.

"It's not exactly a song I admire. Just one I listen to. One that sticks with me. And I'm pretty sure it was meant to be a metaphor. Not something to actually be attempted."

He keeps his hands over the reactor, as if it's somehow going to offend the other man. Like it's a testimony to how much he does not deserve it.