Well, Q is much closer to fifteen than John is, but that's neither here nor there.
The point is, all of the marks he'd left the last time had faded and that clearly meant that John needed an entire new set. Which means that he leaves a mark against his collarbone as well before bringing his head back up to kiss John properly, teasing his tongue against John's lips and giving him sweet little nips and nibbles.
"Why am I not constantly kissing you?" he sighs, dragging his fingers over John's chest.