And at first, Cullen is too caught up in how to properly participate with his hands unavailable to take the opportunity in front of him. But then, breathing going ragged, he sees Alistair at work.

Alistair's lips gone swollen, and wet, and red.

Alistair preparing Cullen for his own use, to his own liking, to his own standards. Alistair giving him the gift of being able to serve. To please.

His own mouth hangs open as he struggles to keep his hips from pumping; Alistair will expect discipline from him. Some self-restraint to go with the actual restraint.

And when the feel of Alistair's tongue is so nearly too much to bear --

"Stop, stop if you want me, I'll come, I'm coming -- "