"Come." she commands.
She straps you to a bed close to the middle of the room and puts a hood on you blocking your vision.
You feel her hands move towards your cock.
You hear a click of a lock and your cock is free.
"There, now you've had the key."
This isn't what you had in mind when she said you would get it back.
One stroke is all it takes from her fingers for you to become fully erect.