A/N: Written for the Gift-Giving Extravaganza 2013, month two. This is for mew (mew-tsubaki), who requested "science bros!BruceTony with some Stony thrown in, along with innocent!Thor and Clintasha." Well. This is what happened.

Also written for the 5, 10, 20, 50, 70, 100 Fandoms Challenge at HPFC. This is my second fic for that challenge.

Finally, many thanks to lovelyapper for betareading this.

one (1) unbuttoned shirt

They confuse him every now and then. He doesn't want to admit that he's sometimes completely unaware of what they're talking about, or what they're doing. So instead, when that happens, he just smiles. (He has started to note things down whenever this occurs, just out of interest – or boredom, maybe – and so far the chunk of paper on his belt is alarmingly thick.)

"That's really creepy, you know?" Tony is standing next to him, button-down shirt unbuttoned (another thing Thor doesn't quite grasp. Why wear something with buttons if you're not going to actually use them?) and a toothpick dangling in the corner of his mouth.

"What?" he asks.

Tony punches him in the shoulder, so Thor repeats himself. And receives another punch.

"If you were a loudspeaker you'd be blown up so many times," Tony says, and when Thor opens his mouth to say another "What?", Tony puts a hand across the blonde's mouth. "Seriously. Lower your voice," he says, his eyebrows knitted together. "Your volume is too loud."

"It is?" Thor questions. He tries his best to say this not as loud, but Tony seems unhappy with it, as he shakes his head slightly. It makes Thor feel like he's a lost cause, and he doesn't want to be that. He makes a mental note of practising speaking quieter.

"It is. However, my primary reason for this conversation was in fact your smile. You can't stand in the doorway looking at the agents with a smile like that on your lips."

"I cannot?" Thor grabs his hammer when Tony leans close to him.

"You look like a paedophile," Tony whispers, and then he pats Thor's back, and leaves.

Thor looks around himself for a second, and his eyes crinkles up in a smile.