Your mom 'gets' to watch you fuck Robin

Robin pulls your mom over to a chair facing the bed and sits her down. Your mom is obediently complying now, not putting up a fight when Robin grabs her arms and puts them behind the chair. She does squirm a little when Robin behind to bind her wrists together, but it's too late and your mom is bound to the chair.

Robin is behind your mom now, head right on her shoulder, with both of them facing you. "Here's your reward... Mommy... Look at that sexy stud there. I'm going to let you watch him fuck my brains out." Robin strips her top off now and jumps in the bed. She starts on her back, beckoning you. You strip as you stand and step towards the bed. Soon you too are naked, cock already rigid from watching your sister fucking with your mom. As you climb on top of Robin she pulls you in and kisses you passionately before she grabs your cock and positions it at the entrance to her pussy. You enter her and Robin moans. Once the kiss is broken she's looking at your mother, making sure your mom can see the look of pleasure on her face as she takes your thick cock.

"Yesss... You feel so good Michael..." your sister moans. Her hands roam her body up and down her breasts and abs before she reaches for your ass. She grabs what she can of your cheeks and pulls, urging you deeper in her. "Fuck me baby. Fuck your sexy young sister girlfriend." You pick up the pace, a little faster now, a little harder, but she wants more. "Harder!" She demands, still watching Mommy. You slam into her sexy body. She's holding eye contact with your mother but he head is jerking every time you bottom out and crash into her body.

Your mother is holding eye contact as well. You can't tell if she's aroused, submissive, or if she's just too dumbstruck at this point to turn away. Whatever it is, it's now your turn to get in on the action. There's no need for you to feign being apologetic or feeling guilty. It's time to reassert that Robin is yours and show your mom that even though Robin now has sway over her, you still have away over both of them.

You grab Robin's neck, pinning her to the bed as you start fucking her harder and harder. Her teen tits bounce up and down from the fucking you're giving her. You hold her head so she can still watch your mother. Instead of words all she's getting out now are mostly moans and squeals. "That's it you dirty little slut, show mom how you love my cock. Show her how hard you like getting fucked!"

On top of all the naughtiness of fucking in front of your mother, it finally throws Robin over the edge. She screams and cums hard, squirting on your cock. Her head is still facing your mother. Her eyes are closed, but your mom can still see all the pleasure on her pretty young face. You continue to fuck her right through her orgasm, getting yourself getting closer. "Fuck I'm so close!"you announce.

Robin comes down from her orgasm and turns her head to face you. She has a wicked grin on her face and you return it. "Yes Michael, yes! Cum hard inside me, fill your dirty sister's pussy.". She lets the words hang for your mother's benefit before telling for the second time today "Breed your little slut!" You erupt and begin to fill her, grunting and pumping her full of cum.

"WHAT?!?!" Your mother screams from the chair, the first sign in what seems like forever that she was even conscious. You both ignore her for the moment.

Once your sister has drained you, you pull out and walk to your mother. Time to seal the deal, and with one last mind fuck too. You hold your cock in her face, still semi rigid. It's covered in a mix of you and Robin's juices. Your mom is conflicted, wanting it so bad, and caught in the emotion of being powerless. You feed both sides of her emotions by pulling her jaw down and thrusting your cock in her mouth. You grab her head and go all the way to the hilt on her several times. You're happy to feel that she immediately returns to pleasing you, her tongue swirling on your shaft like a good girl.

And now for the mind fuck. Robin is laying on her back on the bed, propped up on her elbows. She's facing your mom, and as you pull your cock from her mouth, she's faced with Robin's sexy body. Legs spread, knees up, your mom can see the creampie leaking from your sister. She doesn't know that Robin is on the pill, so you pull one last string to reinforce that she's yours.

As you both look at your beautiful sister, you whisper in your mom's ear. "Sounds like you don't like the idea of me breeding your sexy daughter. I guess if you want to try and prevent that, you could try to eat all my cum from her pussy. Or maybe you'll just do it because she looks so fucking sexy and you can't resist eating her out. Either way..." You untie her from the chair. "Here's your chance."

You don't know for sure which reason is motivating her, but you have your suspicion as your mother lunges forward and begins to devour Robin's pussy. Robin moans and you join her on the bed, kissing her hard as your mom licks at her full pussy. Then you grab her tits and begin to squeeze them, making Robin's moans louder. You step things up again. "That's a good slut. Make Robin cum and I might give you a reward"