You never expected your house maid would find your key and then blackmail you to stay her little toy when she caught you wearing your cage and took some photos. If you fired her, she would just release the embarrassing photos.
All dressed up and at the party, only you were aware of the cage you had locked onto your self earlier that night, that was until someone said to follow them to the balcony. Once there they demanded you show them what was making the jingling noise, now t