It's not al about the kinky sex, although that's certainly a nice aspect of it. But what feels more important is that Jack really was listening to his concerns and came up with his own innovative solution to them. It makes him feel a lot more at easy not just about the sex but about things in general. That they really are getting this right.
"I'm glad you're working to your advantage, then." He replies with a smile, very happy to remain here against him for now. "I'm looking forward to sharing this with you."