The Demon Queen's Most Loyal Knight

Hello! I'm looking to do an RP as follows:

The Demon Queen, Mephist, is a truly deplorable monster, by human standards anyway. Using her powers as a succubus, she managed to sap away the powers and loyalties of the other demons of the Underworld until finally claiming her seat as the Queen. Beside her, though, was a lone warrior, whom she'd made her knight. Initially, she merely wanted this knight for his strength, but found he had the ability to resist her seductive abilities, and never spoke a word. He displayed unyielding loyalty to Mephist, using a Great Sword emblazoned with Holy Fire to permanently dispatch her enemies.

Since becoming Queen, Mephist has amused herself by a making a toy of the hellish masses, using them to kill, humiliate, and rape anyone she felt like; occasionally engaging in the debauchery herself. Yet all the while, her knight, whom she'd called Shield, stood ready to defend her. His loyalty was not unrewarded, Mephist was known to be uncharacteristically charitable and affectionate to Shield. It was a common occurrence to see her cuddling him in the throne room, and being particularly vile to anyone who would insult him.

Now, her eyes are on Heaven, with the Human Realm between them. 

For this RP, I will be playing Shield. I would like a female (or female-playing) partner to play as Mephist. For story content, and progression, I do have an ending in mind, but it will take some time to get there. As for sexual encounters, Mephist is the kind of girl who takes what she wants, when she wants, so she should be initiating encounters and foreplay, but she will exclusively acknowledge if Shield does not consent.

Any other questions can be answered in EcchiText, and I hope to hear from you all soon!