It is all rather overwhelming. But there's something good about it, the way the emotions slowly work through his system and leave nothing behind. It's as much a part of this as the sex was and he's only just realizing that now even though they've done this a few times in the past.
He doesn't know how long it takes him to calm down but it doesn't really matter. Jack's through through all of it, warm and soild and close and that feels like the most important thing out of all of this. Eventually he does take a final few deep breaths and finally start to really relax - aside from the pain from his bruises of course. "Thank you. For all of that."