Just as your identical half-sister walks in

The door opens, and your eyes go wide as you see your half-sister step inside, dressed in her maid uniform. She closes the door as she steps through, and only then does she notice your position. You're already too far gone to stop yourself, and so you cum helplessly as your half-sister watches.

Your half-sister, Cecilia, is a bastard, a by-blow of your father on a castle maid. You'd become aware of her when your father exiled her and her mother from the castle when you were both four years old. You understood why he sent her away - to avoid risks of troubles with the succession, especially with her looking just like you - though you understand him having his way with a maid when your mother was still there less. But the act of her being sent away had never quite sat right with you, and so after you were crowned you had discretely set people to work tracking her down. Once you found her, you offered her a better-paying job in the castle and taken her into your confidence. It was nice to have someone you could speak to about things of lesser importance, and the two of you had become fairly close.

But she was not aware of your proclivities. Not before now, at least.

The two of you stare at each other in silence for a while, both of you stunned - albeit for slightly different reasons. You probably make quite a comical pair, the naked queen crouched in her juices with a dildo buried in her cunt and the clothed maid looking down upon her. You try not to think too much on that, however, as things are awkward enough as it is without you getting wet again.

Eventually your sister swallows and crouches down herself, looking you in the eye. "Anne," she says, and to her credit despite everything her voice only shakes a little. "Would you mind explaining to me what I've just walked into?"

You hesitate a moment. It's only natural, after all; this is going to be a significant change to your relationship no matter what happens, and you're not at all certain how Cecilia will react. But, well, it can hardly get more embarrassing than this, and truth be told you were considering mentioning some of this to her before. You start detailing your fantasies slowly, pausing to gauge her reaction every now and again, but as you continue and she doesn't react with disgust or horror you find them spilling past your lips in a torrent of confessions and desires.

Eventually, though, you run out of things to say. Once more you slow, and then stop. You look at your half-sister, watching as she considers your words. It takes a while for her to come to a decision, a wait before she opens her mouth.