It hurts a little, starting off, but it's a good pain, the kind of pain you suffer through with the knowledge things will be looser later on. Beckett sucks in a breath through gritted teeth when Castle's thumbs make contact with those bothersome knots, relentlessly working them into breaking up under pressure. Her hands clutch onto the arms of her chair and she rolls her shoulders forward.

"Don't get too excited," she softly replies.