First you wore panties, then you dressed up, now you are locked in a cage that you lost the keys for and there is only one way left to feel release. Let's hope you are a fast learner.
These days the girly looks and the cage were just part of the normal attire your mistress expected of you, however the leaking in the cage that was constant, was punishable by a whip, cane, or longer sentence. It all depended on her mood.
Even before the empire, women were collared and sold. It is only natural. So join your place amongst your sisters, and submit to the natural order. It is the only way to be truly free.