Don't worry, John. You won't feel that space for very long. Jack passes out pretty quickly, more quickly than he would have in his van for sure, werewolf night not withstanding. And he's still and quiet for maybe half an hour, before he starts shifting around in his sleep. First it's a little snuffling noise and a move of his head, then it's rearranging his arms up against his chest and under his head. Then it's a little shuffle closer to the source of warmth.

Then butting his head up against John's side, which results in stillness for a little while at least, before another shift rolls him right over and puts his head right on John's stomach, like it's a pillow, tails stretching out over John's feet.

Sorry, John.