It wasn't as if Ron had never touched her before, but this? This was completely different. Hermione could feel her pulse quicken as his hands slid down her side; soon certain that the sound of her heart beating was echoing through the bathroom as she stood there completely naked in front of him.
Fair was fair, and so she carefully pushed his boxers down his hips, letting them fall to the floor and taking a moment to really consider the fact that there was nothing left between them.