Mystery Author, I love that Luna is the watcher. She's absolutely the sort who'd have the patience to watch and wait, and to learn someone's patterns like this. She's also the sort who would never take things beyond this stage, who might never feel the need to, and that's sort of interesting and sad and admirable and strange all at once. Very like Luna, I suppose.
She didn’t want to get caught masturbating in the common room.
Not really.
Your use of this is fantastic. It makes me wonder... if she ever found out Luna was watching, would she say anything? I suspect not...
Someone else called your use of the tie "inspired", and I think that's a great word for it! Quite an inventive wank, and very hot!