She'll take your place, and make you a sexual relief tool

"Well, we are identical," Cecilia says. "If you teach me what I need to do, it wouldn't be too difficult for me to take your place. And then I'd have the power to give you what you want." She reaches out a hand and starts caressing your body, and you can't help the shudder that runs through you. "Maybe I could make you a public relief toy?" she muses out loud. "Just something anyone can use to get off whenever they want." She tweaks your nipple and you moan.

"But of course, only if you want to, Anne," Cecilia says, smiling at you. "Do you?" Her hand stills, and you take a few moments to catch your breath again. Then you look into her eyes and nod, slowly and clearly. Cecilia smiles brightly at you. Then she reaches down to the dildo still resting inside you.

She's hesitant about moving it at first, watching your reaction. You do nothing to stop her, and you gasp in pleasure when she shifts the dildo so it's deeper inside you. That's enough for the hesitation to melt away, and she begins making languid, deep strokes with the toy. "Now now," she says as you melt around the sensation, the feeling of not being in control of it, "I want to hear you say it, Anne. I want to hear you say that you're giving it all up to me." As she speaks the speed of the strokes she's making speed up, and once she finishes speaking the speed picks up even faster.

It takes you a moment to find your words through the pleasurable haze that's descending upon you. Through lustful pants and moans you force out, "I, Queen, ah, Queen Anne, he-hereby yield, oh, everything to my, hah, my half-sister. I give, mmm, my crown, uh-and my kingdommm, my-y name, uhnd my pers-personhood, to Cecilia, forrr her, to use, guh, or discaaaard, as she chooses. Oh, CECILIA!"

With a loud cry you cum again, this time under your sister's ministrations.