WillLack

I am looking for a story where Hermione offers herself to Harry as a sub, he hesitates and spends a couple of weeks reading up about Master/Sub lifes and then agrees to run Hermione's life for her - I recall it is set in their 7th year. Later in the story Daphne finds out that she is drawn to Harry too - her Friend Tracey is also in a sub/master relationship etc - and there are rules that Masters have to follow - chastisement for breaking rules needs a witness etc, Harry does not gratituously inflict pain etc - actually is sick when he has to chastise Hermione for challenging him being the Master I am sure I saw this on this site - can you help - Thanks