He doesn't last as long as he wants to: fucking Jack's mouth had nearly set him off and he's been holding back since then. He tightens his grip as his movements become shorter, harder, until he comes with a sharp, low moan. He lets go of the collar so he can push Jack down by his neck, pinning him like that as he finishes with a few more snaps of his hips. "Shit," he breathes.

He stays like that for a moment, and when he finally pulls out he's careful... and he puts the plug right back into place.