Yes, you fuck her from behind

You watch your mom eagerly licking Robin's pussy. You quickly realize it isn't about removing cum when your mom shoves two fingers in Robin's cum filled slit and stays pumping them in and out. Robin's moans are so sexy to hear, especially when you're watching your mom causing them. You kneel next to Robin on the bed and present her your cock. She quickly accepts the subtle invitation and sucks you into her mouth where you start hardening right away.

You fuck Robin's beautiful face, quickly fully hard again in her mouth. Soon she's moaning and you pause to let her talk. You pull your cock from her mouth, drool hanging between your thick head and her lips. She looks up at you lovingly, breathing hard between the face fucking and the pleasure your mom's tongue is giving her. "As much... as I could suck... this beautiful cock all day... I think Mommy... Oooooo... has been a good little slut... I think... You should fuck her like one."

At that your mom starts fingering Robin faster, and Robin throws her head back. She falls back onto the bed, grabbing your mom's head and shoving it into her pussy. You hear your mom moaning into Robin's sweet young pussy as you make your way behind your mom. You yank your mom's shorts down to her knees. With her ass high in the air, you can clearly see the butt plug still firmly embedded in her asshole. You press on the words "Mommy Slut", gently pushing it barely deeper but getting a reaction out of your fuck toy mother.

You take your hard cock, wet from Robin's mouth, and rub the head up and down your mom's slit. "Fuck you're wet, you little slut. You must really be **** for this cock in you." You hear your mom moaning frantically moaning into Robin's pussy. You grip her hips and thrust into her, moaning as you feel how soaked she is. Your cock effortlessly slides all the way to the hilt. Holding on tight to her hips you start pounding in deep forceful thrusts.

Robin feels the jolt of your mother's face being **** against her pussy with every thrust. "Yes! Yes! Fuck your little mommy slut hard Michael!" She urges you, and you can tell she's choose. Her moans turn into high pitched screams and then you see her back arch, thrusting her pussy up into your mom's face while she takes your cock.

Robin relaxes back to the bed as she recovers, but your mom is just getting started. Released from her job pleasing Robin, she now focuses on you, throwing herself back into you desperately. She forces your cock as deep as she can, loving the sensation of her son filling her tight pussy. You spank her ass and she moans in pleasure. "Thank you, sir! I've been such a naughty little slut! Please use and punish me however you want!" Your plan is working better than you could have ever hoped.

Robin is recovered now and crawls to your mom on the bed. She grabs your mom's throat and pushes her up until she's more closely kneeling than on all fours. "That's a good little whore," she says looking her mother in the eye. She yanks your mom's tank top down to reveal her tits. They aren't as perky as Robin's, but they are so much bigger. You can see a little jealousy in Robin's eyes, but you can also see her imagining the possibilities.

First she reaches out and grabs one of your mom's hard nipples, pinching it. You feel your mom tighten and squirm. Next Robin lands down to suck that nipple into her mouth. Your mom grabs Robin's head and pulls her in, so overwhelmed by all the attention after being so neglected by her husband. Robin kisses her way back to to your mom's lips and makes out with her. She grabs your mom's hair and pulls her out of the kiss so they are looking in each other's eyes. "I think you're really learning your place, mother dear..." She teases slightly before she slaps one of your mom's big tits.

To your surprise your mom screams with delight and you feel her clamp down on your cock, exploding and squirting on the bed. "Fuuuuucckcckkkkkk" your mother screams as she explodes then goes limp between you and Robin. Robin seizes the opportunity.

Robin looks up at you. "I think Mommy slut is begging for more baby... Maybe you should fuck her ass next." Your mom just moans in anticipation. Robin reaches around behind her, spreading her ass for you. For the first time, Robin sees the butt plug. "You dirty little whore," she says with a grin, "you've been dying to have your ass fucked all along."

Your mom is panting still from her orgasm. "Yes! Yes! I've needed a cock in my ass... Michael's fat cock... So bad mistress!" She practically screams. It's a confession, like the weight of the world fell from her shoulders as she was able to admit it to her daughter.

Robin holds your mom again by the throat. She slaps her tits and mom gives another moan of pleasure. "You're lucky I'm so generous with Michael's cock." Another slap, another moan. "And that Michael is so generous stuffing your holes with his fat shaft." Another slap, another moan. Now Robin pulls the plug out and spreads your mom's ass again. Your mom is ready and you pull out of her pussy to slide your cock in her ass.

"Yes! Fuck yes!" Your new slut cries out triumphantly as she feels you filling her ass. You pin her arms behind her, making her tits stick out even more. You hammer away at her ass, eagerly accepting your thick rod with mommy's juices all over it. "Harder please master!" She begs. Robin slaps her tits as they bounce, reminding your mom that she's there. "Yes! Harder please mistress!" She begs Robin as well. She's your toy now. All yours to use however you want.

You fuck harder and faster now, feeling your orgasm getting closer. Your mother's dirty mouth makes it hotter, and Robin eggs you on. "That's it baby, fuck your little mommy slut's ass" another slap on her bouncing tits "fill your little bitch with your hot cum."

You can't hold on any more and explode with a deep grunt. You bury your cock in your mother's tight ass and explode, pumping your hot load deep in her. You trigger another orgasm for your mother and she squirts again. You hold her up while you finish emptying your balls into her then you allow her to collapse on the bed.

You're breathing hard, and Robin gives you a moment before she crawls over to you on her knees and kisses you hard. "That was so fucking hot baby. So so so fucking hot." She fits in between kisses.

You know you need to do something and finally realize what. You break your kiss, smile at Robin, and grab the rule book. You open it and add an entry.

Old rule: When a man finds out he's been cucked, he becomes submissive to the man that took his wife.

You toss the book back onto your stuff and grab Robin again. "We could make every day like this, baby. Fucking each other, using mom... Would you like that?" You ask rhetorically while you cup her pussy and rub it. You just get back an emphatic moan as she starts imagining it, even though she doesn't know how you're going to do that. "We should tell father that I took his wife and cucked him, that she's mine now, and he answers to me."

As it should work with the rule book, Robin acts like she's known her whole life. "Of course! That's brilliant!" She kisses you hard again. "I can't wait to see the look on his face when you make him your bitch." She looks at your mom, who's recovered mostly and is very attentive to your idea. "What about you, slut? Do you like master's plan?"

Your mom crawls on her hands and knees back to you. "Yes mistress, I love it. I can't wait for you to make it so I don't have to hide and can serve you and master all day!"

"Then I think you can get started right now," you say, grabbing her head and forcing it to your cock. "Clean my cock, Mommy slut." Your mom happily obeys and begins bobbing up and down your shaft, deep throating you and cleaning you with her mouth. You pull Robin back into a deep kiss, making out with her while your mother makes out with your cock. You can't wait to take the next step in your plan.