Set free, but locked up

She takes your phone out of your bag and types something in.

"Message me when you're 'ready' "
She smirks.

She pulls the rope end, loosening your bonds, then slips out the door.

You gather yourself, shocked at what had just happened. You fidget with your lock for a moment to no avail. Rather than spend more time on it, you decide it best to get out of there before anyone else shows up. You quicky put on your clothes and head home.

You look in your phone and you see the name "Mistress Anna" saved.