Derek stops just inside the window and gives Stiles A Look. "... okay." He evidently isn't sure why this is being shared with him, but after a moment's hesitation he comes the rest of the way in. And drops something, which turns out to be... one of the shirts he's borrowed in the last few weeks, freshly laundered and neatly folded, before turning and brushing a hand across the nape of Stiles neck without any apparent conscious thought. "And did you need them?"