He finishes her right side, easing her head in the other direction with the backs of his knuckles. "Uh huh." His thumb tucks discretely behind her left ear, pauses, then draws a small, tight circle against the back of the 'lobe.

She's fairly loose now, but Castle can still find sore spots. He tends to each one tenderly but with purpose, wanting to leave her boneless in the chair.