The fingers in his hair are so unexpected and so comforting that Jim actually makes a sound, covering the bald longing in his voice as best he can with a squirm for the hypo. He doesn't have long to feel anxious about it at least, for Bones is right. Already he can feel the drug working its way through his veins, bringing with it a pleasant warmth that makes him sigh.

"Thanks," he breaths, smiling at Bones. "Feels better."