By giving you too much of a good thing.

"Naughty SMACK little THWACK sluts!" Cindi smacks your delicate derriere with a studded paddle conveniently located with an awe inspiring assortment of other **** devices. "I just asked you to go ten minutes without fucking the cum out of each other. Was that too much to ask? That I get to watch two twins fuck the cum out of each other for the first time? Sure, I can always watch the security footage, but you know I prefer live theater, ****. And, Ella, didn't you want to share it with me?"

Her words sting way worse than any spanking ever could. You crawl to her and beg at her feet, "I'm sorry, Mistress! I want to share everything with you! Please punish me! I'll endure anything if you forgive me after." Emma shoots you a dirty look and you know you are going to regret offering 'anything', but not as much as you would regret losing Cindi for a moment of stolen splendor.

Cindi lifts your chin with her boot, so she can peer deep into your eyes. You don't know what she sees in them, but her piercing, ice cold stare melts a little and she sighs, "I really shouldn't spoil my pets, but you just beg so beautifully. Alright, ****, get Ella ready for...The Mangler. And, of course, you'll be joining her." Emma goes pale, but you notice a sickly smile as well, as if this is a punishment she is looking forward to in a sick way. You wonder woefully what that means for you as Emma helps strip the last of your lingerie and hands you a pink rubber body suit.

You strain to slip into it, struggling to get it over your ass and noticing a zipper in back, but not in front. You find other zippers over your chest, and you feel embarrassingly exposed as Emma unzips them to show off your pretty, puffy nipples. You worry as you slip the mask over your face that you will be left in the dark, but luckily Emma is allowed to unzip your mouth and eyes. This relief is short lived as you see what is in store for you...The Mangler!

It sits in the middle of the room, a massive, menacing machine made of steel and suffering. The engineering behind the gears and pistons are a mystery to you, but their purpose is clear. They power the two 13 inch rubber rods in the middle of the machine. Leg straps hang on the side to keep you firmly held in place as...The Mangler works it's infernal magic. It looks like it could fuck you for hours and hours, and that thought terrifies you almost as much as it titillates you.

Cindi steps behind you, unzipping you from behind and exposing your almost eager asshole as she whispers, "I have good news and bad news. The good news is that you are going to learn to control yourself today. The bad news is you are going to do it strapped to that. You are going to learn how to stop cumming if it kills you. Oh, and your slutty sister is going to be strapped right in front of you, and who ever learns their lesson first gets to be my favorite ****. The loser...well, just don't lose, Ella."

You are trembling uncontrollably but you follow meekly as Cindi leads you by the hand up onto...The Mangler. It strikes you that you are almost as thrilled to hold her hand as you were to bury your face between her legs. You don't have time to process this thought before you are pulled up onto the machine and your legs padlocked into the stirrups. You watch Emma do the same, her look of ambivalent anticipation scaring you more than the gruesome gears and perilous pistons. If a slut like your sister thinks this machine is too much for her, what does that mean for you?

You don't have to wait long to find out. The monstrous manhood of...The Mangler is well lubed, and gravity and the fucking Emma gave you do most of the work of stretching your ass impossibly wide as you sink deeper on a shaft than you ever had before. You whimper whelplike as you feel your rubberclad rump rest on the padded seat. You are so full of synthetic shaft that you feel like you are going to burst, the pain is like nothing you have ever experienced, but that isn't what worries you.

What truly terrifies you is Emma's expression, which you can only assume mirrors your own. Sure there is pain painted across her face, from her fetchingly furrowed brow with beautiful beads of sweat forming. There is fear too, in her dreamy deep eyes, open wide and holding you helplessly in her gaze. Even her usual sultry smirk is twisted into a pouting pant of pain. That would all be scary enough, but even more alarming are the hints of arousal...the way her she is sucking the beads of sweat off her lips...the tiny spark of lust in her eyes that threatens to burst into flames...the hopelessly horny expression as the cock begins slowly pistoning inside you both. You are so engrossed in staring into your warped reflection, that you only notice your own orgasmic eruption by watching Emma squirt on the punishing prick.

"God, you two sluts are something else. Well, I might have missed the first time you came together, but at least I'll be here for the 100th." Cindi takes a seat in a sex swing giving her a perfect view of your pounding funishment. You start to appreciate just how awful ecstasy can feel when it's **** upon you. Every inch of you is fighting the explosion of ecstasy inside you, sending sticky shrapnel cutting through you, leaving you helpless before the bliss boiling over in your frail form and sending sissy squirts out of your untouched cockette.

You gasp for air and try to regain control of your body, but you aren't sure you ever had it. Just as you start to catch your breath and feel like you just might be able to fight your bodies natural instinct to submit and spurt...The Mangler adjusts its angle of attack and picks up speed. "Fuck fuck fuuuuuuck! I'm OOOOH suh AAAAAH sorr UNNHUHUH sorrEEEEEEEEE!" You beg forgiveness even as your body betrays you. Carpetbombs of climaxes lay waste to you. You flail like a fish on a hook, but you are hopelessly hooked on the cock corrupting you. You begin to panic, what if you never stop cumming? What if you are fucked into a cum coma and you never recover? You look to Emma for support, but she is too busy bucking back on her inhuman invader and grinding her sopping slit along her seat.

That's when it hits you. You don't have to be faster than the bear, just faster than her. If Emma is such a slut that she can't stop cumming, you might when by default when you are milked dry. And if you were to help her along, you could be Mistress' favorite ****. She looks so lost...teetering on the edge of insanity...