He had no idea what the hell to do when he got to the library, which was why he took his own sweet time getting there. It didn't help that she had asked him to meet her in the secluded spot in the library where she and Moony usually studied, either. Since it was just that. Secluded.
Shoving his hands into his pockets, he rounded the corner of the shelves and approached her slowly, mainly from wariness, though since it was him it probably have off the appear of laziness.