You wanted to try it out and she said yes? It is probably not as you had imagined? Too bad for you that she liked it so much and now she starts to use her power over you!
She was the one who suggested the new chastity cage in the first place. She also suggested the PA piercing, which was still painful. Now, She wanted the keys.
When your girlfriend unlocks you on release day, you’re not allowed to get hard until she says so. After a month in chastity - and her delicate hands teasing your clitty - you didn’t stand a chance.