three (3) fading letters

Bruce sighs. Loudly. He's increased the loudness of his sighs excessively over the last ten minutes. Tony is still singing along to Greased Lightning.

"Tony."

"She's a real pussy wagon—yes?" Tony looks up, pushing his protective glasses up on his head.

"Would you mind stop singing?" Bruce makes a vague gesture with his hand. "I can't quite concentrate."

"We all have our ways to concentrate, don't we? And since ours aren't compatible, I mean, silence isn't exactly the same thing as hearing my own voice. I'll stop, so it's fair."

Bruce gives Tony a light smile, and returns to his calculations. His screen is flashing with diagrams, and he's fairly certain he's closing in on the solution he's been searching for all morning.

Then Tony grabs hold of the back rest of his chair and spins it around. "Did you know Point Break's smile can be real creepy?"

"What, how?" Bruce spins right back, trying to return to his screen. He's so close, dammit. He can't let it go now.

"I mean, everyone seems to believe it's the sunniest, nicest ever, but you know, found him staring at Barton and Romanoff as they trained, with that very smile."

"And?" Bruce has dug his heels into the floor and tries to wriggle his chair back around, but Tony is letting all his weight lean on the backrest.

"And," Tony punctuates heavily, "he looked kinda like he'd jerk off to it."

Bruce raises his eyebrows slowly. "Well. I'm quite certain that's just how he looks. I mean... It's Thor."

Tony lets go off the chair and Bruce sort of stumbles around on it as he hadn't noticed how hard he'd been trying to defeat Tony. "But it's scary!"

Bruce stares at the screen, finally having it in front of his eyes again. Now, where was he?

Tony begins to say something else, but what distracts Bruce is the sudden knock on the glass door. Outside stands Steve, a brown paper bag in his hand which he points at, a huge smile stretched across his face. He seems to have breathed on the glass since there is a bit of haze left, as well as a few fading letters of the word Tony. At least that's what Bruce believes; now it only says ony.

Tony looks at Bruce.

Bruce snorts and turns back to the screen. "Weren't we just talking about creepy smiles?"

Tony punches him on the shoulder as he passes, but Bruce can see Tony is also hiding a grin as he joins Steve.