”Remember to bring him with you when I fuck you.”

Ashley fidgets and looks embarrassed at her sister outing their incestuous relationship so boldly.

To be fair you are taken aback by it, and this whole situation honestly, but if you had a sibling with a cock like Amy’s you’d probably have a hard time resisting too.

“Well?” Amy says expectantly. Staring her sister down. Ashley looks from you to her sister and seems to stare at you extra hard. Feeling self conscious you look down and notice yourself subconsciously grinding into Amy‘a dick.

Ashley finally responds. “Yes, okay.” Her dick still bright red from being rubbed so hard begins to rise back up until it’s eye level with you.

“Yes, okay what?” Amy says expectantly.

“Yes, okay...Mistress.” Ashley finally says, seeming mortified at you seeing her so submissive.

“God fuck, was that so hard, now come here.” Amy shoves you off and pats her lap. You fall to the side and see a familiar look in Ashley’s eyes. One you’ve never seen on another person but can still recognize because you were making it earlier.

Ashley lifts her skirt up and squats over the bitchbreaker you’d just gone crazy riding. She reaches down and to your shock spreads her pussy lips apart before she slides down into her sister’s massive cock. You’re shocked as even in the rare case a Futa girl lets someone fuck them, it’s almost always in the ass. Futa pussies were so rarely used these days that a lot of girls didn’t even have them, and they were almost unusably sensitive from neglect.

You see her face shudder in pleasure. That cute lip biting that had always made you want to kiss her takes on a whole new meaning as Ashley begins to thrash on the cock you just slid off. Her whole body going into pleasure induced spasms when Amy’s massive cock is hilted into her pussy.

You watch enchanted as the beautiful girls with their beautiful cocks fuck right in front of you. Amy still sitting there relaxed, somehow much more domineering and oppressive than if she had been grabbing and throwing her sister around. She was cool and confident while Ashley was unwound and heated up.

You somehow felt yourself get hard for what must have been the tenth time tonight and cant help but want to reach out and touch Ashley’s cock thats waving there so tall and free.

Suddenly you Amy’s foot comes up and pushes you back, casually overpowering your and forcing you into the ground.

“Not so fast lover boy.” She says, “While I’m fine with you two having your own thing on your own, when I’m here you two are mine above anything else.” She moves her foot down towards your chest as she talks, “You aren’t boyfriend and girlfriend or even fuck buddies, you’re just my subby **** little sister and my tight little personal asspussy.” Her foot goes lower now pressing on your dick, “You two both focus on me when I’m here, I don’t want you two so much as cuddling or kissing unless my dick is between your lips when you’re doing that kissing.” Her foot begins to rub your dick. You feel embarrassingly small as her big toe covers more than half of your dick.

“Fuck, Yes!” Ashley pants out, seemingly turned on by these restrictions her sister is setting. Amy grabs her and pulls her in tight, still sitting there with one arm out at her side and relaxed she forces Ashley’s head back and begins to make out with her forcefully. The fact that Amy can so casually pull Ashley around makes your dick twitch, her relaxed stance making it all the hotter when she casually dominates you both.

You sit there, watching as your best friends tits are thrust out by her sister’s back bending hold. Ashley’s tits that you’d fantasized and dreamed about, bouncing in the air so close, but you weren’t allowed to touch them. It’s not even the physical restraint that’s stopping you but, to your shame, it’s something deeper. Somehow sitting there not touching them because Amy told you to is turning you on more than actually touching them would.

Amy pushes her sister forward and finally sat up a bit, grabbing her waste and beginning to piston into Ashley’s bent over body. She’s still standing with one foot on you and the pressure from their body weight makes you pant and gasp.

“Remember that no matter how much you two kiss or cuddle, me and my dick are the ones in charge!” Ashley begins to pant and twitch about in front of you.

“I don’t care if you two are on a date, if I get a boner one of you comes running,” she stood fully up now, and lifted Ashley’s hips up so her feet and hands were just off the ground. Ashley’s body that once’s seemed so large and dominating now looking like a small cocksleeve. Her beautiful tits were swinging so violently they began to smack the bottom of her face, hitting her wide open mouth and slowly creating a trail of saliva from her chin to her nipples. Her stomach was being warped and stretched, that pale expanse of flesh that you'd jerked off to after seeing Ashley in a crop top once, was now being used as a sleeve for her sister's dick.

“If you two are home together cuddling and watching a movie and I walk in the door, you’d better believe that you’ll spring apart and suck me off so I can de-stress.” Amy still has her foot on your dick as she stands over you fucking the girl who before this seemed so powerful and dominating in your eyes.

“If I wanna barge in on your fucking wedding night and empty my balls in one of my cumdumps, you two will ignore each other for the next fucking week if I tell you two and just serve. My. Fucking! COCK!” Amy yells out with a final thrust, releasing a flood of fertile futa cum into her sister's womb. Ashley throws her head back and you can see her perfect Ahegao face, eyes back and running with a line of mascara that you can only imagine she'd put on for your date tonight, her long beautiful tongue out and wagging like a dog's. Ashley's dick jets out with her own cum, spitting out cum that you'd normally find perfectly normal, but in comparison to Amy's it seemed watered down.

Amy drops her to the cum covered floor next to you and you see Ashley’s pretty pink pussy that earlier looked small enough for your cock to feel big in it, now stretched almost as wide as your fist and made a painful red color, seemingly dumping out an endless wave of thick, musky cum. You reach out to get some of it when strong arms grab you.

Suddenly you’re picked up by Amy and her slowly softening dick is thrust into you before it can get fully flaccid. You haven’t cum in a while so you start to move on her shaft before she grabs you by your arms and picks you up more so you’re totally off the ground, it feels like half of your weight is being supported by her dick in your ass.

Amy walks over to Ashley’s bed and lies down with you on top of her. “You don’t touch your dick all night. I wanna see a full fucking spray onto little miss buttsluts face before I go, got it.?” Amy demands as she settles down for the night.

You nod and lie there, your cock hard as iron and begging to be touched but left ignored, your body sticky and wet but left uncleaned, your asshole full with her still massive flaccid cock, and your friend or girlfriend or fellow cocksleeve (you’re not sure if it’s one of them or all of them) **** on he ground, stewing in the cum puddle you both made and leaking with the one her sister made.

*Not sure on what the standard is here in terms of if Futa girls just have dicks or if they have dicks and vaginas, but for this branching path I’m assuming enough of them have a pussy for it to not be statistically improbable for the whole family to have both.