Margaery dominates you

"I submit," you say out of breath. "My Queen."

"Mistress," Margaery says with a smile. "Say it. 'You are my Mistress, Queen Margaery, I live to serve you and you own me."

"You are my Mistress, Queen Margaery, I live to serve you and you own me," you repeated, trying to wriggle in your bondage without success.

"I am your dog, a mindless puppy to be played with," Margaery added with a smile. She straddled you, her bare clit rubbing your thigh. Her large brown eyes were hypthothising, giving you no chance of resistance.

"I am your dog, a mindless puppy to be played with," you said.

"Good," Margaery said, taking a ring gag from nearby and forcing it into your mouth. "Now let's put this mouth to better use, shall we?"