They've been together long enough that she's come to learn his quirks almost as well as her own. Including his hatred of wearing sweaters, or anything else that doesn't come with a cape, really, and that's why she doesn't buy him clothes for his birthday very often.
That's also why she stops short, floored, when she sneaks into his work area, turns from the desk where she's just set down a tray with a fresh cup of coffee and a sandwich, and catches sight of something deep leaf-green and cable-knit.
"You're actually wearing it. I knew the colour would look good."
He winces visibly, and when he turns, his expression is sulky, and all the more theatrically so to cover up a hint of something sheepish but nevertheless half-proud at the surprised delight that she's trying just as hard to hide.
"It's just because it's so damn cold it here because some idiot forgot to close the windows, so don't get too excited."
But despite his snappish reply, she can't seem to stop smiling the whole way back to the control rooms.
Not least, because his work area doesn't have any windows, and was as ungodly hot today as it always is.
Maybe she'll push her luck a bit and get him that brown leather jacket for Christmas.