Charlie watched her walk away towards the kitchen and quickly pulled up the front of his trousers. He aimed his wand down and muttered a gentle cleaning charm. He winced a little as it was still kind of rough. Charlie needed to learn some better charms for that sort of thing.
He pulled his composure back together and smiled up at her as she handed him the glass of water. He took a few big gulps. He was glad she was happy. It gave him a relaxed feeling. Things were going well.
"I'll help you cut the trousers off, if you want," he said with a smirk. He was joking of course, unless she was gonna do it.