[Okay, that-- is going to make him turn slightly red, and for a moment he just stands there, not sure if he should let it happen or...
...he slips his arm out of hers deceptively easily, but he doesn't move away from her.] It isn't that I'm thinking about serious things, I just... look serious. Maybe I'm thinking about a bug I can't fix, or something I need to do, or remembering back home. That's all.