Whatever reply he might have come up with abruptly blurs and warps into a breathless "oh god" as she drags her tongue up the length of his cock. Sherlock tries to stay focused on her, to maintain eye contact, but then she begins to slide the tip of her tongue around the head of his prick and his eyes slip shut for a second out of some sheer primal instinct to concentrate on how this feels.

One of his hands lifts to touch her, fingers threading through her rumpled hair.