It took him a minute to realize it was happening, truth be told. When Stiles got lost in a book, it wasn't an exaggeration. He could lose hours when he read, though he'd been trying to avoid that since the nogitsune fiasco. But it was there, Derek's fingers tangling slightly in his hair - a reminder that he really had been meaning to cut it. He put the book down, still open, on his chest and looked up at Derek. The older man was sitting next to Stiles on the couch, engrossed in a book of his own, although he hadn't needed to perform a gymnastics routine to get comfortable the way Stiles had. He didn't seem to realize he was doing anything out of the ordinary, the book holding the entirety of his attention, so Stiles picked his book back up and kept his mouth shut, letting himself enjoy the warm and fuzzies of the moment while he could.