You knew they were also locked when they asked to lock you up, but you had no idea they expected you to match the time they already had in their belt, and since she was Ace it wasn't difficult at all for her to last the 3 years she already had.
She dressed you up in her old uniform and took your photo. You looked different enough, but people who knew you would know it was you. She then used these photos as leverage to get you to do more and more humiliating things until finally she locked you i
Finding a friend who was also into chastity was amazing, her ability to be super cruel and leave you locked for days or weeks on end without anything except being teased the entire time, however, was slightly less awesome. You were almost regretting tell