Crichton can practically see the lightbulb going off over Arthur's head. There it is... and, boy, is Crichton relieved to hear that it's a good sound and not one of disgust. So, that first failed attempt of theirs wasn't just a fluke.

(Let it be known that only by great restraint is the narration NOT making hobbit hole jokes.)

"Think you might be interested?" Crichton asks, leaning in to brush his lips against the hollow where Arthur's neck meets his shoulders. He nibbles the skin there with feather-light scrapes of teeth.