This book is amazing, especially if she is unsure of what Femdom is all about and you (the male sub) really would like to have a Female Led Relationship.
I read it years ago and it really cleared up a lot of misconceptions I had about the mindset behind a sustainable FLR.
And of course somewhere in there is stuff about orgasm control, chastity, etc.
https://www.amazon.com/Uniquely-Rika-Ms-Rika-ebook/dp/B08KY4FGFP/