Stand back up (More anal)

More fucking? Sounds like a deal! You try to stand up, but it's quite hard from all the ass stretching you just got. You slowly walk, legs wider than usual, over to the couch.

Before you can sit down, Mia gets up and rushes over to the couch, saying "Wait wait wait, hold on! I wanna do it like this..."

She takes a seat on the couch and spreads her legs wide, making enough room for you to stand between them. Mia's cock is already rock hard again and pointing straight up.

Mia speaks up again "Ok, now sit right down..." She says, grabbing her cock with one hand.

You get excited again and move over to her and turn around. You look back and try to guide your stretched asshole over the tip of her cock. Since your anus is about an inch wider than usual, Mia finds no trouble popping the tip of her cock right in your butt. The feeling is not nearly as forceful as last time, but not one bit less pleasurable. You turn your head back and find that Ava is moving toward you, her hard cock bouncing around with each step.

Mia catches you off guard, by thrusting up and sending her cock more than halfway down your ass. You moan, and the feeling of having your ass stuffed with cock is back again. Mia grabs your legs, and spreads them wide, raising your feet above the ground. Your ass is now exposed, and just at Ava's cock height. Ava walks in between her sister's legs and presses her cock against your asshole. Without warning, Ava grabs your legs and with one single thrust, jams her dick all the way down your ass, right next to Mia's. You moan loudly and cum from the feeling of the huge cocks of Ava and Mia back in your ass. Your jumpsuit has a giant wet and white blotch on your crotch, from your third prostate orgasm.

Ava taunts you "You came AGAIN? Well, we haven't even started fucking you, so get ready to do that some more. Gee, I wonder how many times we can make you cum, without even touching your cock?"

Mia chimes in "Only one way to find out..." and slams her dick right up against her sisters, straight in your ass.

Ava moves her cock out a little bit, before slamming it back in your ass. As she does, Mia moves back, and the rhythm that the girls set before is back on board.

Ava is holding your legs tight and using them as leverage to fuck your ass. Meanwhile, you are laying on top of Mia, being bounced up and down with her cock, as she holds you close, by wrapping her hands around your torso. You look up and see Ava, looking down at you, smiling with her mouth open while pumping your ass. Her tits jiggle with each thrust. When you look down, you can see the outline of the cocks being rammed into you on your stomach, pressing it upward. The giant cumshot you received, makes sliding in and out your gaping ass very smooth. The room is filled with heavy breathing and audible slapping sounds. All you can do is sit there, and take the brutal bounding with a smile on your face.

Since the girls already had a huge orgasm earlier, it takes longer for them to get off this time- over an hour to be precise. You've cum about 3 more times during that. Your ass doesn't even offer any resistance at this point and is just being used as a fuck hole. The girls have also shifted the rhythm and, instead of pumping in and out of you separately, they now do it at the same time, like one giant futa cock fucking your ass. This creates a bigger total impact, giving both you and the sisters, even more, pleasure out of your body. As they get closer to orgasm, they speed up their pounding, making your moans sound like you were driving down a bumpy road. You see that Ava's face is no longer smiling, but deeply engaged in the sex, trying hard to keep up with the speed. Then, finally, the girls scream out loud and press their dicks deep down your used up ass, and cum. They cum buckets, making your stomach expand from their jizz again. Ava's knees start shaking, as she unloads load after load of her hot cum in your rectum. After she's done cumming, she falls down to the floor from exhaustion, making her dick slip out and another stream of cum spray over her body. As Mia unloads her last spurts of cum down your ass as well, she too collapses on the couch, letting go of you entirely, but her dick stays in your ass. You are unable to move and just lay there, with your legs open and cum dripping from your anus.

After a couple of minutes of recuperation, you finally gather your strength and lift yourself from Mia's, now flaccid, cock, letting some more cum quickly spill out. You take a seat right next to Mia, as you simply don't have enough energy to move anywhere further. You look down, and see that Ava is laying down on the floor, slightly covered in her own and her sister's combined seed, but conscious and slowly trying to sit down. Mia is just laying on the couch in the same position as before, but looking quite happy with herself.

Ava takes a seat on the floor and speaks up "Damn, your ass really got us going, dude. Just look at Mia, she's completely wiped out."

Mia looks over at her sister and says "Hey, I'm fine. If anything, it looked like YOU were having the most trouble keeping up with the action."

Ava looks annoyed at Mia and says "Oh fuck you. I'm too tired to fight now, wake me up when you stop being a bitch."

Mia gets mad and tries to say something back, but is quickly interrupted by Ava's snoring, as she falls fast asleep on the floor.

Mia turns towards you and says "Ah, fuck her. You can probably just leave now. Thanks for the fuck and everything, but I don't think Ava's ever going to come to her senses. It's best if you just leave now..."

You look over and see that your room door is open. You slowly stand up and waddle over to your room. You didn't get the sisters to like each other, but you still got an anal pounding you'll never forget. Sitting down in your shower, you take some time to empty the gallons of cum inside you. After that, you take a nap and try to get over the ass pain the sisters just gave you twice over.

You got the "Double up" ending with Ava and Mia.