Oh no, he went there, he voiced it in a manner that Hermione couldn't play dumb over. This conversation was proving to be a bit too much. He had been asking her to... test out the handcuffs with him. Well, maybe he wasn't and she was reading things into it. That was probably it. She could be reasonable about this.
"Well, you should have an assistant period. You don't want to accidentally maim yourself or tie yourself to something and not be able to get free," she nodded sagely. "And considering your new line, the right kind of assistant..." She trailed off, proud of her ability to keep her voice calm despite the need to blush she was feeling again.