Incest Seduction/Lay back onto your stools
You scowl at your mother. She's hardly giving you an option. You can't stop now. You are so close to winning you can taste it... although you're mostly tasting your brother at the back of your mouth. But the point is that you've come so far! That can't be for nothing! You only wanted to get cleaned up, mom. You wouldn't be getting dressed or anything. It shouldn't be a big deal to go upstairs just for a shower. But fine. If it means losing then you won't be clean. You'll be her dirty daughter.
Resolved to win at all costs, you huff and slowly lower yourself back onto the stools, as if there's no point in doing anything if you can't shower. Yes, your face feels slimy, your pussy is a sloppy mess, you are hot and sweaty and covered in cum. But you're going to win.
"Oh sweetie," coos mom with sympathy. "Don't be like that. Mommy will always take care of you, my sweet baby girl."
Mom talks you up a while longer, rubbing your thighs soothingly, before eventually parting them. Taking only enough time to pull her hair back, she promptly crouches in front of you to start lapping up the creamy mess spread across your crotch. She's delicate at first, perhaps teasing, mostly playing with daddy's semen. She flits her tongue up the sides of your lips, then plants the tip of her tongue on your pelvis and slides about, connecting little pools of wetness and dragging cum all around, arguably creating an even bigger mess. But then she starts cleaning you in earnest, slurping speckles of semen off of your belly and licking your slit like a popsicle.
You try to stay angry while mom eats you out but that's pretty hard to do. It'd be easier if you didn't want her eating you out, but it really doesn't bother you. It should, probably, but it's hardly even an outrageous idea to you now given what else has gone on this morning. Ultimately the reason you can't stay mad is because you're still as horny as you are tired. Getting so brutally dicked by daddy took away so much of your resolve that it's hard to fight anything. So having anyone poke at your privates is so welcome because you can't do it yourself and you still want it so bad. The bonus here is that your parents are really good at this whole sex thing.
After a minute you push up onto one elbow to watch your mommy suck on your clit while she massages your vulva. It feels so good that you can hardly even keep your eyes focused on her, but you need at least one brief look at what she's doing to you. Your insides are still sore but, despite how much daddy had to stretch you to fit inside your pussy, your bald little slit is still loving every kiss, lick and caress placed upon it. Mom notices you watching past droopy eyelids and her thumbs start to pry at your asshole, evilly threatening to enter your virgin backdoor. That gets your eyes to open, at least for a moment. She's only teasing, but the teasing works because you can feel your wetness gush at the thought that you could be violated even further than you have been. After a few tense moments mommy repositions her thumbs to spread your lips apart instead so she can suck and lick other parts of your sex, all in search of more of daddy's semen.
Your head rolls about when mommy starts tongue fucking you like before. You catch a fuzzy figure at the bottom of the stairs which makes you think of your brother, but you have no clue where he or your father have wandered off to. Instead it's your older sister that comes into focus. She has her phone trained on you from a distance but isn't saying anything. You lift a hand above your head and weakly give her the finger. She just smiles then walks away. She has to know mom is eating you out but you would've thought she'd be more shocked, or at least throw shade at you. Even if she somehow didn't notice what was happening she undoubtedly has photo evidence that she'll discover later. For the time being you only hear the front door closing, Dawn leaving the house without a word.
Mom sure isn't concerned with anyone watching. She's started using her finger like a dipstick to sample the depths of your cummy teenage pussy. But that only gets her more riled up. Soon she's fully finger fucking you while she sucks and tongues your clit. Even as tired as you are, there's no doubt in your mind that you can cum for her. When a thumb drifts it's way to your starfish again that moment simply arrives sooner than you expected. It's that threatening digit that really pushes you over the top, makes you squirm and shake, your eyes rolling back into your head.
"Muh.. Mooom... MMmmuuMMMuuuUGHhhhh...!"
Your mommy makes you melt, nearly slipping right off the stools as you climax yet again. You have to drop your arms down under you to grasp desperately at the legs of your pedestal as you teeter halfway off it. But you do it. You hold on for dear life so mommy can keep licking your clit for as long as she's willing. And you're so thankful she's willing. When her mouth does pull away from your sopping wet slit your body is visibly shuddering with every outward breath.
"Oh God YES Kimmy!" cries mom as she drags her nails up and down your slight frame. "You're an amazing little thing! God am I jealous! I bet I could make you cum all morning if I wouldn't get lock jaw. Honestly, I wish I could've done that at your age, just to always be on the edge like that. I don't think you even drank any of the orange juice, did you?"
"J-ju-juice?"
"I mean it's fine if you did, it's perfectly safe. It should have kicked in by now, but that was only meant for daddy."
"Whuh... juice?"
Mom helps right you so you don't succeed in crashing to the floor and hurting yourself. "I put a, shall we say, 'performance enhancement' into the orange juice this morning. So... you're welcome," mom adds with a wry smile.
"But daddy... And Zack? They... drank that...?"
"Let's just say they each had a very expensive glass of orange juice," chuckles mom. She then taps your semen spattered chest a few times to emphasize her words. "And worth every penny!"
Mom wipes her mouth dry and shuffles around the kitchen to sort out the lingering remnants of the breakfast cleanup that you didn't finish, gossiping the entire time with you about how your father never seems to get as hard as he used to, how many times a day they can do it now, how it even helps some girls, and on and on. It would be a weird enough conversation for her to have with one of her girlfriends, but to be having it with her fully naked and still halfway cum covered fourteen year old daughter is exceptionally out there.
You're as sweaty as ever after yet another orgasm which makes it harder to sense where the slimy bits are on your skin. Mom graciously 'cleaned' your bottom half - sorta - but your chest and face are still peppered with Zack and daddy's combined raw baby batter. If you didn't witness it happen yourself, you'd never know it was still there, and certainly not by the way mom is acting so perfectly normal. Talking about weird sex stuff is par for the course with her from time to time. You normally just tune that out. But she's treating you like you're ready to go to school.
But what's with the orange juice? Mom said she spiked it? Not with alcohol. At least you assume not. Maybe it was like a mimosa or something? But you had some orange juice. Didn't mom pour it for you? It might have tasted a little weird but you're not sure. If it did you didn't think much of it. You suppose alcohol would make it more expensive, but mom has never made a big deal about mixing a drink around you before, even if you're not old enough to indulge yet.
After catching up to your thoughts, and your breath, you finally blurt out, "What was in the orange juice?"
Mom sighs. "You really need to stop daydreaming sweetie. It's exhausting. I told you, it's like viagra, but on steroids. It might actually be viagra with steroids! You never know, do you? But it sure works!" Mom laughs. You wait for her to continue. "I didn't expect your brother would drink a whole glass. He had that smoothie phase but he's always been more of a milk or water boy. That's just what happens at college isn't it? He's already changed so much. And yet he's SO much more like your father than I imagined! He really grew into those big feet of his, didn't he!"
Mom laughs again but you start to tune her out. Did she really feed her whole family boner pills? Thankfully she mentioned it's safe for girls, but... is this why you feel this way now? No, it can't be that. Not just that anyhow. You've been horny all morning. But what about Zack? How long does it take for those pills to work? Was he only hard around you because of mom's juice? Did mom rob you of your only accomplishment this morning? That you might finally be grown up enough to have made the brother you've had a crush on for years be attracted to you?
You glare at your mother. Inside of course. You don't want to annoy her or anything. But you gaze at her, through her, trying to figure out if she's lying to you. You don't know why she would lie about this, but this wouldn't be the first time mom has lied for fun. She might be trying to take the wind out of your sails, make you feel less empowered by so much sex. Or maybe she's spinning a story that more easily explains how you've become a living fuck toy this morning. Or she's just weird enough to drug her whole family. That fact you can't rule out that last one is a tad scary.
Part of you wants to run straight to daddy and tattle on mom. He'd probably appreciate knowing why he's been so horny around his daughter. At the very least he could confirm whether he owns any dick pills. If he doesn't then that should prove mom is lying and that your brother's arousal on the couch was real. But... maybe you should just ask your brother about his feelings. You were teasing him about it before because actually asking him is really hard. But maybe if you can be more direct, if you can just blurt it out, he'll give you a straight answer.