Incest Seduction/Agree to Dawn giving you an orgasm
"Dawn. I want Dawn," you say quite promptly. You hardly had to think about it. If this is all really happening, there's no way you're going to give Dawn the chance to get away from it and lord it over you later. If you're going down you'll make your sister go down with you, or at least go down on you.
"Really? Well of course you do!" mom replies, a bit surprised if not disappointed with your choice. She withdraws her finger and wipes it across one of your bum cheeks. "You heard her Dawn. Don't keep your sister waiting!"
"What are you talking about! She can wait forever. I'm so not doing that!"
"Alright. Then give me your phone. You're excused."
"Wait!" Dawn picks up her phone from the table and pulls it down into her lap. She jumped at the mention of her phone and is then quick to start negotiating. "I'll... like, hold a vibrator or whatever." All of you know losing phone privileges is Dawn's weakness. She really would do anything to avoid that.
"No, you will be the little lesbian you pretend to be in front of your friends, an-"
"Mooom!"
"And you will give your sister a good old fashioned orgasm."
"Whyyy??" whines Dawn.
"Because it would be good for you to put a little effort into something for once that didn't involve a selfie."
"Ugh..." groans your sister, rolling her eyes.
"And because I don't think a vibrator will teach her much of a lesson. Not yet anyway. But if you can do what I ask - for once - then I'll also let you break her in with one of my vibrators."
"Gee, thanks," snarks Dawn, then hurriedly gets up from her seat to avoid a scowl from mom. But as she walks around and looks down at your cream filled cooch, she takes pause. "So... Just, like, my fingers, right?"
Mom, standing to the side but still holding back one of your legs, pats your upturned bum. "You do to your sister whatever you have to, as long as you give her an orgasm."
Dawn, sighing once more before resolving to complete her 'chore', slides dad's chair back up to the table and sits down in front of you. With a grimace on her face she pulls up her phone again, tapping away in her own little world while sat in front of your pussy, seemingly avoiding her task for one last moment. Mom lets go of your leg, expecting you to now keep them both where she wants them, and plants her hands on her hips to demonstrate her frustration.
"Your sister is waiting." Mom's robe shifts again, slipping its way further open, the two sides barely still meeting below her navel. The loose hanging knot and her motherly nipples are the only things holding back the plunging lapels of her robe.
"Well I can't just disappear, mom. People are waiting for my next share."
"Whatever," groans mom, retrieving her coffee and turning away before getting into an argument about social media. "Just take the selfie already."
The flash of Dawn's camera lights up on cue, but it isn't pointed towards her face. She lights up your underside then reaches in and spreads two of her fingers to split your vulva and better expose your messy lips for her camera. All you can do is glare at her, knowing full well that mom isn't in the mood for tattle tales.
With Dawn's latest 'selfies' taken, she sets her phone down and pokes at your sopping sex with disgust. She pulls your lips this way and that, hesitantly dipping one finger, and issuing the occasional "Ew" and "Gross" to humiliate you even more. Maybe she really doesn't like the idea of sticking her fingers into her father's cum - and that's fair - but it feels more like she wants to make you feel worse about the sloppy state daddy just left you in.
As Dawn pokes her fingers deeper into your creampie, daddy returns to the dining room holding two beers. "Oh. Dawn?" he remarks, walking to the opposite end of the table and setting down one of the bottles in front of Zack. "I figured you might want some of this." Is daddy talking about you or the beer?
"Thanks," is Zack's short reply. He sure isn't about to share that he already had you if they don't already know, and that's probably the same reason he hasn't objected to any of this yet. Dad just pats his son's shoulder, something that wouldn't be so awkward if daddy's long floppy dick wasn't swinging openly at the same height. It's your first actual glimpse of it, daddy's cock, although it's a bad glimpse with how hard you have to crane your neck just for a peripheral glance. Still, you have no idea how all of that managed to fit inside you.
"What's wrong with my orange juice?" asks mom, moving toward her boys. "You should finish yours by the way," she adds to Zack.
Daddy rubs mom's arm and nods. "I've had plenty of vitamin C, honey. Needed something a little stiffer."
"Mmm. I think we all do."
Mommy sets her mug down next to Zack's beverages then presses herself into the side of her husband. Daddy slips a hand around her waist which finally undoes her knot, allowing her robe to fall open, hanging from her shoulders, just as she lifts a leg to rub the inside of her thigh against his. Daddy leans down for a kiss while mommy innocently places a hand on his pelvis. It's not so innocent when her hand drifts onto his cock, palming the top of his lengthy shaft.
Mom has never been shy about groping daddy or grabbing his butt, but it's all a little different when they're both standing at the table naked after breakfast. Daddy, usually the one to stifle mommy's heat, instead finds a spot on the table for his own drink and gropes mom's tits with his cold hand. She gasps at his touch and starts grinding into his hip in a very showy fashion. You can tell Zack is trying not to watch, and failing. Then again, so are you.
"Ugh. Daaaad, are you ready to stuff her again yet?"
Dawn's comment makes daddy pull away from mom's embrace with a chortled cough. He walks away from mommy sporting a rising semi as she reluctantly closes her robe, annoyed if not disappointed that she couldn't scratch her own ever present itch.
"No, I was just, uh... about to grab my pants actually."
"But why is there so much cum?" she adds, lifting two fingers to pull up a long stringy trail from your slit.
"Just do what your mother said," daddy barks back, perhaps a tinge of guilt about finishing inside you.
Smirking, Dawn lowers her voice and pushes two fingers back into your slimy hole. "You know, you're like an actual cum bucket."
"And you're like an actual cunt," you shoot back.
"Daddy's girl."
"Hoe."
"Hooker."
"Girls," warns mom. But Dawn fingered you harder when she insulted you, working more of daddy's cum out of you and turning your slit into an even frothier mess. For a few seconds she was making your pussy hum with pleasure again before mom's warning made her slow down to avoid looking eager. So now you want to antagonize her.