To be perfectly honest, if he had been on his own, Benjamin would not have undressed completely. It was winter, after all, and much as he had stocked the fire, he would not risk catching a cold in his sleep. With the prospect of John in his bed, however... Part of him did not want to take off a single item of clothing, but it was not the greater part of him. The pragmatic part of him recognised that sharing body heat would keep them warmer than if he had been on his own, and the greater part of him just needed to crystallise something about that night. To not do things halfway.
So after he had pulled his shoes off, he got started on his own clothes, much fewer than John's on account of them only being the ones he had put on an hour or so ago. He felt oddly vulnerable, undressing, as if he were getting naked in more than one way - and he was, really. He felt open, vulnerable, and self-conscious, but he was too stubborn to let those win him over.