Doggy-style!

You smile as the perfect idea comes to you.

Without saying a word, you grab Sharon's wrist tie and pull up on it. She has **** but to move, since you connected it to a tight crotch-rope. You drag her over to the desk and lie her stomach first on it. You have Tory grab some rope for you and you tie each of Sharon's ankles to a corner. This keeps her still and spread eagle for you.

For the final touch, you tie some rope around the back of her hair and tie it to her elbow and wrist ropes. This forces her to keep her face straight ahead and up.

You drag Christine around to the other side of the desk by her nipples and place her stomach first on the desk. You give her hair a similar tie to that of Sharon's.

"As you may have figured out, I'm going to fuck you doggy-style," you say, "As a bonus, you and your friend have **** but to stare at each other the whole time."
"Can I help somehow, Master," Tory asks.
"Actually, you can. Stand behind Sharon while I fuck 'Mom.' If she's good during this, lick her pussy. If she's not, spank her ass!"
"Yes, Master," the co-ed says with a smile.

With all of that out of the way, you line your dick up with Christine's pussy and **** your way in. She stays loose for you, no doubt out of fear in regards to what you'll do to Donna if she doesn't! Sharon's pussy-licking got her pretty wet too.

Once you're fully inside of her, you begin to fuck her properly. You pull out partially and slam your dick back into her! This isn't making love- this is fucking!

"Fuck me back," you order Christine, "Show me that 'Mommy' loves this!"

The brunette MILF does what you order. She thrusts her ass back into you with each thrust, causing a more concussive fucking to occur. You keep this up for a few minutes before you decide to up the ante.

"Are you enjoying the show," you ask Sharon.

She doesn't reply. This leads to Tory spanking her hard on the ass. She does it four more times until the buxom redhead breaks.

"Yes...I am," Sharon says sadly.
"Talk dirty to her," you order.
"You-you-you're a slut," she mutters.
"Louder and dirtier!"
"You're a dirty slut," her friend says, now with more passion.
"More!"
"You're a dirty slut who loves to get fucked," Sharon shouts, "Take his cock!"

Taking your orders to heart, Tory gets down on her knees behind the busty redhead and licks her pussy. She begins to moan quite quickly.

"She's wet already," Tory says, stopping for a moment, "I think that she likes to be spanked."
"A pain slut, huh? Keep spanking her," you reply, "Just keep her off-guard."
"Yes, Master."

So it goes for a while. You keep fucking Christine, while Tory alternates between spanking Sharon while also licking her pussy. The question is this...