Incest Seduction/Lay back and close your eyes
You're too tired to care. You stop paying attention to what's going on in the room and completely zone out on top of the dinner table. Once your sister wanders away, you actually enjoy a brief rest as there are discussions about things, going back and forth on who is doing what, voices moving around the room. But you keep your eyes closed, entirely uninterested.
Your eyes get heavier the longer they are closed. You barely even open them when you feel something new poke at your slit. But when two hands scoop you up behind your waist, forcing your split legs to bend into an even less comfortable position, you look to see what's going on, expecting that maybe daddy is strapping something else onto you. Instead, it's Zack who's lifting your butt off the table.
"Whuh? ZaaaAAAAHHH!!"
Your brother sinks into you violently, bucking his hips forward while pulling on yours. Your poor lips are torn open again, a thick cock molded from your father's remarkable member pushing deep inside you. Despite how wet and horny you still are, your pussy closed itself up tight after being left unattended to for several minutes and your brother's heavy drive forward feels just like when daddy first ripped his way through your virginity all of an hour or two ago. Except this time there's also a glass cock lodged in your bum. Mommy might have forgot it there, but you sure haven't.
"How are you this tight?" complains Zack, a grumbly look on his face. He didn't strip himself like daddy, just flipped his lamppost out over his waistband. You moan in response as the bottom of his shaft grinds along the bulbous dildo pressing up against him through your ass, a sensation which only makes you squeeze both of them harder.
"Mhmm" says mom, stepping up beside her son, her robe dangerously close to opening again after her vigorous activities with you. "She doesn't even know how much of a cute lil cooter she has," she says in a babytalk kind of voice.
Mom places a hand on Zack's shoulder, staring down at your straining lips as he thrusts past them. She then smiles broadly after listening to the guttural exhalations of pleasure induced in you by Zack's cock slinging. "See baby? She doesn't mind at all that you're helping. In fact, I'd say she's loving every minute of it! You're insatiable, aren't you Kimmybear?"
"Mom. Ew." Dawn says as she sits down at the table again, a nearly empty vodka cooler in one hand. Did she grab that after eating you out? Probably to get the taste of daddy's cum off her tongue. "No nicknames. Not right now."
"We've called her that her whole life," contests mom. "What do you expect me to call her?"
"What she is. An eager little slut."
"Dawn," scolds daddy. He's fiddling with your wrist bindings at the other end of the table, tying them down somehow. "She's your sister."
"Okay. Sissy slut." Dad stares at her, unamused. "Sister slut?"
"No."
"Sounds like a naughty nun," giggles mommy to Zack, who smirks.
"Well I dunno! I can call her lot's of other things. There's cumslut... Cumwhore? What about cumdump? That's kinda punchy."
"No, no, no..." repeats daddy.
"Or Cummybear," offers Zack while grunting. Mom tsks him with a smile, rubbing her hand over his stomach and pulling his shirt away from his pelvis.
Your sister giggles now. "Little Cummy Kimmy? That's amazing!"
"No it's not! Listen, maybe Kimmy is a little... needy, but she's not just a sex slave." He pauses for far too long after claiming that, watching his son pummel his nude youngest daughter's defenseless body that he strapped down himself. Daddy clears his throat and continues. "We're helping your sister. She's still our Kimmy, punishment or not. Right honey?"
The room goes silent for a moment. Save for the wet thrusting from Zack's dick and your sexual whimpers and exclamations, everyone is more than open to watching you get fucked.
"Oh lighten up, James," counters mom, finally replying after happily soaking in the sight of her coital offspring, and specifically of her son's powerful pistoning cock. "Kimmybear, Cummybear... They've called each other worse."
"Hear that?" Dawn leans over the table, ardently flicking one of your nipples. "You're totally Cummybear now, slut."
The name rattles around in your head as you struggle to think of a clever reply, or anything really. Instead of a comeback, "I'm... cummy... bear...?" is what you eek out between moans.
"It is a little cute," insists mommy, rubbing your taut inner thigh. "And you're a very hungry Cummybear! Aren't you?"
You can barely think, let alone respond, as you struggle with the double penetration levied on you by your brother and mom's dildo. Even though he seems to be holding back a little compared to when he took you in the kitchen - maybe because everyone is watching, maybe just to keep his balls from smacking against a glass plug - he's still pushing your cervix back and shifting your dildo around with each lengthy thrust.
Mom's dildo is something else though. You had never even thought about regular old anal before, but with a hard bulbous rod now stuck in your ass you can't stop imagining what it would be like for your father and your brother to be fighting for space inside of your body at the same time. Your eyes flutter open and closed as you imagine it, your head rolling from side to side.
"Aw, she's close again isn't she? Let's get her together, baby. Both of us."
You feel a thumb attack your clit while Zack keeps thrusting. Mommy leaned past Zack to get to you and, in doing so, one side of her robe fell all the way open exposing one of her full motherly breasts. She hangs off of your brother's shoulder, her tits swaying freely, while angling herself closer to the action. And then you feel the side of her finger press along the bottom edge of your stretched pussy, pressing against the very edge that Zack's cock is sliding against, and in turn pressing her hand right against his dick.
"Don't mind me! Just keep doing what you're doing..."
With mom's hand in the way it's pretty much impossible for Zack to keep going the same as he was. Your brother's thrusts suddenly become more shallow and he doesn't hit as deep. But even with mommy distractingly cradling the base of Zack's shaft while simultaneously thumbing your clit, your brother chooses to speed up instead of slow down. This awkward conjoined sex act has all three of your motors revving.
"Mmm. You've got her right where you want her, don't you baby? Your sister is so lucky."
Mommy's whole hand shakes a little, putting extra effort into both you and your brother, her finger half spinning around the ring of your stretched hole as she cradles his thrusting cock. She smiles and stares up into his eyes while he fucks you faster and faster. His sweats seem to have slipped from Zack's hips with his frenetic pace, but mommy could have helped them along as well. You just growl, moan, outright howl your pleasure, overwhelmed by the fullness and speed and taboo of everything going on.
Mommy turns to you with a lustful gaze. "Go on. Cum for us Cummybear. Cum for your brother. My strong man. Let him help you. Come on. Be a good girl for mommy..."
Every orgasm up until now felt like it was ripped out of you. This time it feels like a choice. Until mommy's very active finger slips its way inside you. She somehow presses her way past your tight entrance to stroke the underside of Zack's cock from inside of your body. She reaches far enough inside you to feel the ridge of his head as he pulls back on each thrust, her knuckle now rubbing the inner rim of your slit against the glass toy still consuming your ass. Incredibly, both mommy and Zee are inside your tight overwhelmed pussy at the same time. Your mind almost breaks as your pussy finds a way to stretch the extra little bit to fit them.
"You w-want me to... cu... cu..."
"You cum, Kimmy. Cum as hard as you can."
Mommy's speedy thumb slips off your clit, and the unexpected flick makes your toes curl, as if you needed more incentive to cum. You explode, a fresh little gush of your juices bubbling past Zack's jackrabbit dick and escaping by the gaps around mommy's finger. You buck and roar, pressing yourself against the table however you can in an effort to wiggle your underside against the myriad of things penetrating your body. At one point only your clenched fists still touch the table.
"Jesus," comments daddy. "Just, wow..."
Watching you buck with pleasure and writhe pathetically against your restraints, your brother also finds his limit. He dumps a well primed load of cum inside you after you start babbling like a crazy person.
"Yes! Yes! Aw fuck! I feel it, yes! Cum in meeee... God. Shit! Ughh you fucker!"
Your brother's cock sprays thick blasts of baby batter inside you. But like your own orgasmic gush, it starts to rush out of you past mom's finger. With the pressure of everything squeezed inside you, and you squeezing back, you can feel some of your sibling's semen spurt out of one of the narrow gaps mom is making, out onto mommy's hand.
As some semen trickles down and runs around the circumference of the hard plug in your ass, your mother realizes what's happening and pulls her finger out along Zack's cock. While you're still screaming like a lunatic, your mother wraps her slickened fingers around your brother's shaft and starts jerking him off while he's still halfway inside you actively spraying cum.
"Oh, baby! Let it out, you stud! Fill her. Cum inside your dirty little Cummybear sister."
Your brother stops thrusting as Mommy enthusiastically pumps Zack through the rest of his orgasm. His face has turned up in a sort of snarl while he tries to hold you still as he's pumped dry. Daddy walks closer, having watched from across the table with a hand blatantly in his pajama pants. Dawn has stood for a better view but simply snickers to herself, continuing to whisper at her phone while she pans around the room.
Zack pulls out of you and sets you down, but even after taking a few wobbly steps back and stumbling onto daddy's chair, mommy follows him, still working her hand over her son's slick member.
"Poor baby. You okay?" mommy asks, crouching down to inspect her son. Zack can only grunt and nod as she keeps jerking away, firing multiple blanks from his flexing cock at the end of his orgasm making him quake and shudder through the remainder of his climax.
"Well if Zack is already done I suppose I should step in," notes dad with a begrudging tone, he slips out of his pajama pants then stops in front of you, placing his hands on your legs and rubbing up and down your inner thighs. You're still huffing and shaking, filled to the brim with your brother's cum. Daddy squats a little then slowly dips the head of his cock into the ocean of spunk that Zack deposited between your lips.
"It wasn't his fault," answers mom. "He just got a little too excited after I tried to help." You can just see Mommy and Zack past your left leg, but only the top half of them. But with mommy's arm still moving and her boobs still bouncing, not to mention the wide-eyed downward gaze on Zack's face, it doesn't take much imagination to fill in what you can't see. "You coulda gave Kimmy 3 more orgasms before popping, couldn't you? This big strong cock of yours. We made quite the mess, didn't we?"
"Aauuuuugghhhhhmmmmm..."
The angry grumble you release as daddy sinks inside your well used pussy gives him pause. After a couple dips into Zack's creampie, he pulls out, making you shiver, then examines you for a moment. With far too much speed, he rips the tower of glass balls out of your bum, the stacked spheres tugging on your sphincter making you cry out with shock, then hum with pleasure as the relief afforded to your backside heightens the enjoyment of your persistent orgasmic aftershocks.
"I feel like you could use a break, Cummyb- I mean, Kimmybear! Dammit." Daddy places the glass dildo on the table beside you, the balls pointing up proudly. "Let's try something different."
Zack releases heavy breaths while trying to calm down. He lifts the hem of his shirt to fan himself and places his other hand on mommy's head, seemingly to signal her to stop whatever she's still doing. But that's not the signal she thinks it is.
"Oh, my sweet boy. I'll help you..."
Daddy lifts your bum just as Mommy dips her head forward. Your thighs rise with you and your sightline to mommy and Zack is blocked preventing you from seeing what happens next. But now that you're back in a more comfortable position for him, daddy lines up his cock - coated in his son's spunk - with your winking asshole. He reaches around your hips with his fingers to help pry your cheeks wide before wiggling his way into your ass. You gasp and groan as your father's thick sausage deflowers your backdoor, just as you hear Zack cry out.
"Muh... muh... mom!"