Let's explore her submissive side.

You decide to train her a bit before fucking her raw, make her earn her fantasy.

"Bend over and grab your ankles, slut."

She looks at you, no longer defiant, not even flinching at being called a slut, but she does hesitate, and that's unacceptable. You stand up, grabbing her hair at the back of her head, forcing her upper body down.

"When I tell you to do something, you DO it, understand, slut?"

She lets out a small cry, more shock than pain. "Y-yes."

You raise your hand and spank her ass, hard, leaving a bright pink hand print. "Yes, MASTER!"

"Y-yes, M-M-Master," she sputters out.

You walk around her, looking over her body critically. "When Master tells you to bend, you ALWAYS bend at the waist, so MASTER can see your ass. Understand?"

"Yes Master." It's a bit louder this time, more sure of herself. She's learning...

You grab her ponytail, again, yanking her upright. "Hands behind your back, slut." As you step back, she complies, silently. Looking her up and down, you're pleased, though you decide to mention her flaws.

"Your tits are a bit small for Master's taste..." you say, grabbing one of her breasts, squeezing it. She lets out a small cry, almost a moan. "Oh, do you like it when Master plays with your tits, you whore?"

Her breathing grows a bit heavier as you continue massaging, yanking, pulling on her nipples. "Y-yes Master. It's making me wet..."

You move your hands again, turning her around, pressing your cock against her ass. She begins breathing heavily, her body shuddering as your hands move back to your breasts.

"M-M-Master?"

"What is it, slut?"

She swallows hard. She's nervous, putty in your hands. "Master, would you please fuck this slut?"

You pause for a second, considering your options.