Anna uses you.

You start licking her, getting her nice and wet. Her juices and scent is all you have for the next what seems like 20 minutes. Then as she's starting to writhe a good bit. She slides off of your face. She takes the key.
She reaches for your penis.

You pull at the ropes straining in anticipation.

*Click.

The lock comes loose and she slides off the cage. Your dick springs forth in the fullest erection you've ever had.

Anna bites her lip, eyeing up her prize.
Then she positions herself over you and lowers down. She coos as the tip of your cock hits her pussy.

She starts riding you. Slow, then fast. Then just the tip, then sliding on your dick taking every angle she can. Then when she can take no more she rides you hard and fast crying out in ecstasy. Her moans send you over the edge and you explode inside her.