Newt is going to ignore that flutter in his chest and chalk it up to Kurt being exotic and sweet and wanting to both feed and blow him. The kiss gave a much more familiar sensation of arousal and distracts him from any other thoughts.

He sits up on his elbows to be able to demonstrate. Even with the limited angle, his hand still manage to animate has he explains.

"Okay you hold your mouth like this," which he shows. Lips kind of wrapped around teeth. "With your jaw to the back. Don't worry about taking all of it, use your hand for the rest."

Technique and stuff would come later. Baby steps, Kurt. Especially with your teeth, dude.