Yes. Right, of course. Body heat. Things they now had no option but to worry about, such as temperature, sleep, food. It makes perfect sense to do the best they could for survival, like the several books of tips and tricks Aziraphale read that had been left in the library made by fellow island residents.

"Hum." There's a gentle uncertain shake to his voice, quiet and soft as it is. But no motion to stop him or to pull away. "--Yes. Quite alright."