McCoy, his other hand still occupied with Jim (at least he could multitask), broke the contact of their fingers to slide his arm round Spock's waist, pushing his hand up the back of her overlarge tunic to stroke the smooth, bare skin of her back; skin radiating the unnatural warmth that, at the same time, felt perfectly natural.

It also certainly hadn't escaped his attention that Jim was investigating - it was hard not to notice something like that, especially when the perpetrator looked so damned hot whilst doing it.