John snuffs out a little noise of amusement at that, decides to leave any embarrassment that might usually come with such a sentiment out of it for now. Because Q is kind of right, post-sex cuddling is totally a thing, and it's totally a thing he's doing. There's nothing wrong with it.
"You're not bad yourself, ta," he murmurs it against Q's lips, like maybe it's less sappy that way, or maybe more kisses will happen anyway.