While he darts into the bathroom, Beckett stays prone, stretching her relaxed muscles and resting the back of her hand against her mouth, absently pulling one finger in between her teeth. She hides her grin despite the fact there's no one there to see it, turning her head in the direction of the bedroom door as the sound of creaking floorboards announce Castle's return before he appears.

"It's why I gave you an extra blanket," she points out, "which you proceeded to kick off. Then again, I rarely sleep in the nude - one more thing Nikki Heat and I do not have in common."

She protests with a cry when he jams his cold fingers in between her legs, weakly attempting to shove him away. Catching a glimpse of the time on the bedside table clock, she lets her head fall against the pillow, groaning.

"Work's going to be murder tomorrow. Pun not intended."