A threesome

As the three of you enter the house, the twins look to you expectingly as if to ask 'what now' but both remain dead silent after what happened in the car. You figure it'll take some time before the awkwardness between them goes away.

"Why don't the two of you get out of those clothes and down on your knees."

Tracy and Mia hesitantly strip out of their clothing, tossing it up against the wall of the hallway, before getting down into submissive positions on their knees and looking up at you. You start walking towards the living room and give the simple command "follow me." The two of them start crawling after you on their hands and knees seemingly competing to get ahead of one another and take the lead. Eventually you arrive at the living room and take a seat on the couch. Tracy and Mia crawl up to you and sit on the floor at your feet, both eyeballing your crotch.

"Alright then sluts, why don't you get started by sucking my cock."

The two of them jump at the opportunity to get at the dick they've been craving and both reach for the fly of your pants. As they both do so, Tracy slaps Mia's hands away as an attempt to mark her territory.

"He's my boyfriend!"

"Then why were you getting railed by dozens of strangers, slut?"

"Come on now girls, play nice. You're going to have to learn to share tonight."

Mia gives a sneaky smile to Tracy before reaching out to put a second hand on your cock, the two of them are now working together to get you hard again. Tracy still tries to establish some semblence of dominance over her sister and makes the first move to start licking up and down your shaft, looking up at you with seductive eyes the whole time. Mia is quick to follow and starts licking up and down the other side of your cock. Watching the two of them do this already has you hard despite how many times you've already climaxed tonight.

With you now at full mast, the race is on for the two of them to wrap their lips around your cock. This time, Mia takes the lead and practically jumps to get your dick in her mouth before sucking around the tip like it's a lollipop. Tracy looks at her with anger and jealousy as she realises she's been beaten. With her just sitting there now, you decide to give her a new task.

"Well Tracy, why don't you repay the favour to your sister for what she did in the car and start licking her pussy."

Tracy looks at you with disdain but being the obedient slut that she is, she does as you say anyway. Mia smiles as she realises she's come out on top of this competition and raises her ass into the air whilst sitting on her knees, taunting Tracy over this win. Tracy moves around to her rear and hesitantly starts licking her sister's pussy. She slowly starts accepting her fate and getting into her new cunt-licking role, and as she ups the intensity you can hear some moans coming from Mia's lips which are wrapped around your cock. Mia also starts upping the ante with her cock-sucking technique, working your shaft further down her throat. After this goes on for a while and you feel like moving on, you provide the two with some new instructions.

"Mia, get up here and ride my cock."

Mia gladly does as she's told and pops your cock out of her mouth to climb up on top of you, using her hand to align your meat with her pussy before slowly sinking down onto you.

"What about me sir." Tracy looks at you with big eyes, clearly upset that you've chosen to use her sister over her.

"You can play with yourself as you sit there and watch me fuck your sister."

Tracy looks disheartened by this, but obeys your command and sits on the floor masturbating as she looks on at her sister riding her boyfriend's dick. Mia bounces herself up and down on your cock with great energy and you can feel her pussy dripping on your pelvis. As she does so her perfect enhanced DD tits jiggle in front of your face and you take the opportunity to latch your mouth onto one and start playing with her nipple with your tongue.

"Oh fuck, your boyfriend's cock feels so good." Mia's now actively rubbing her victory in Tracy's face.

You grab her ass cheeks and use them as leverage to slam her pussy hard and fast down on your cock. She looks up to the ceiling and starts moaning like a whore as you go to town on her pussy. The two of you continue in this position for a while, Tracy looking on jealously with only her hand to pleasure herself.