question: Boarding school for psychically powerful girls

I read this amazing story a while back about a boarding school for psychically powerful girls where half are mind-fucked sex-toy sluts and the other half are their mistresses. I cant remember the title! Please help!

I remember that the story starts with the mother and the daughter traveling to the school and the mother using her power to overpower her daughter to "train" her.

The mother was an alumnus and one of the dominants… She was snooty to her former slave and her slaves daughter who later flips things around!

ARRRRG WHAT WAS IITTTT???

EDIT: found by subbiesub http://www.mcstories.com/LegacyTrilbyElse/index.html