Re: Quicksand indeed, and what a rescue!
Thank you for this detailed, thoughtful (knock-me-over satisfying!) comment; it was heartening to find it waiting for me. I doubt there'll be a follow-up; once a story's written, it acquires a set form that I don't feel like tinkering with. I appreciate it very much when a reader comments not only on the smut, but on the characterisation, and the possibilities of character x situation that she found in the story.
As for Snape's "levy", he was still thinking about it.