They both have military in their backgrounds. Clothes on and off with little preamble is familiar to both of them. Even with romance in the air.

Walking to the desk and back, Carol gives Han a chance to adjust to the temperature in the room when she's not near. Plus an opportunity to feel the change a few degrees warmer when she comes back - independent of his feelings of arousal because that's been consistent the whole time. He still isn't completely certain that she's warm, but he'll be thinking about it when he approaches her again. If there is an again.

For what it's worth ... it's a bit harder for him to keep it slow right now, too.

"You 'bout as heavy as you look, sweetheart? Or does the power make you denser or lighter?"