Hot Summer Job/Reach back to stop whatever Larissa is doing
Is that Larissa? Fucking brat. You straighten up enough to reach behind you with both hands ready to shoo the girl away.
"Larissa," you start to protest as your hands bump up against a girl's stomach. Larissa giggles, which draws your attention elsewhere. The pigtailed girl is still sitting next to you, a silly smile on her face.
Click click click CLACK
You've never been arrested but it doesn't take much imagination to guess what just closed tight around your wrists.
"...the fuck?" you mutter incredulously.
"EVERYbody loves anal, remember? Especially you!"
Kylie's menacingly playful tone sends a shiver up your spine. Although maybe that's from whatever is poking your ass. You twist your body desperate to see what's there and find Kylie wearing some crazy strap-on dildo. Seriously? Cuffs and strap-ons? Is this how she normally packs for a sleepover?
The teen leans into your back and whispers, "You should probably relax too."
Already off balance, it does not take much for you to fall forward after Kylie pushes your shoulders. You teeter for a few seconds then collapse onto your sister.
"OOWWW!"
Your slick cock plunges into your little sis. You do your best to try to save her from it, both angling your body so your head lands beside hers (instead of into the back of it) and keeping your knees firmly planted to avoid dropping into her, but it's hard to counter the momentum Kylie granted you. With your fall forward at least half of your eager member impales itself up your sister's back side.
"Riley!" Bree squirms under you, but doesn't try to escape. You're about to defend yourself, but she likely doesn't know what's going on. "You lied! You said it wouldn't hurt!" she continues.
Kylie is quick to interject. "Guys say lots of things. Get over it."
What was threatening to enter you a moment ago, a meer knock against against the door, is now forcefully stepping through the entryway. From the short glance you stole, it looked like a fairly beefy rubber dick that had shimmered in the light. At least you think it was big. It sure feels it. Then again you've never inserted anything into your ass before, so it's not as if you have a point of comparison. The slipperiness you feel as it sinks into you and evades your kegel like attempts to keep it out confirms that it is thoroughly coated in lube. At least she had that much foresight. More than that, she has first-hand experience thanks to you.
"Kylie get the fuck off!" Finding some clarity, you reach your bound hands down to your ass. This is unexpectedly difficult, but you do your best to grab at the shaft of the dildo being pushed into you. That doesn't last long. You can't maintain your grip on the slick rod, so when Kylie tugs on the chain of your cuffs and pulls up on your wrists you can't do much to stop her.
"What do you mean? I'm just playing our game. You fucked me in the ass, didn't you? And now it's my turn.
Kylie plants her hands on your butt and drives herself forward. You can't help but shift your hips away from her as the pressure increases inside you. With all the panic, rage, and fright coursing through you now your erection cannot help but soften a little. But it's still plenty stiff enough to continue its descent into your little sisters bum.
Despite your limited efforts, your body sinks its way down to meet your sister's. Kylie has your arms locked behind you. Your hips dive forward wanting to protect your ass from its intruder. This pushes your whole body forward, your face sliding across the mattress a few inches and your dick levering inside Bree's asshole, tugging forward. The only way to stop that is to kick your knees out to compensate, still split between balancing over your sister and avoiding the rod up your ass. And so you slip deeper and deeper into Bree's smooth little asshole.
Curiously, considering your sis is in a similar predicament as you (because of you) she is handling it a lot better than you overall. Other than her initial protest, she isn't really complaining.
"Is that mom's?" asks Larissa, still bemused by what she's seeing.
"Yeah. I've worn it before. It even vibrates with this."
And with that remark, your anal probe comes to life with a loud buzz. The shock of this additional feature makes you clamp your rim tightly around said probe which only works to heighten the new sensations it is offering you. Your whole body goes stiff and you push the rest of yourself into Bree with a quick buck, both of you grunting. You're practically pushing her flat to the mattress now, but your sis is still doing her best to stay up on her knees as directed.
"I'm... I feel really full," notes Bree.
"Don't worry, s-so does your brother," Kylie offers, her voice breaking.
"Isn't he supposed to move now?" Larissa asks adorably.
"Yeah Ry." Kylie finally pulls back from you. She's still inside you, but the relief that washes through your anus brings you to shudder. Until she pushes into you again. And again. "You should fuck her, fucker," she chides while in the midst of doing your ass as mechanically and reluctantly as her chores.
You imagine you feel just as Kylie did before - conflicted. This was fun at first but now it's a bit scary. It's true you fully intended to fuck your little sister's asshole before you got your own hole stuffed with a vibrating dick. Part of you wants to run away - and kick Kylie in the cunt - but the rest of you is strangely enjoying this. Your cock strains and throbs inside of Bree's tiny bum with each buck into you from Kylie. It's all begging you to move, to properly deflower the young asshole you've penetrated.
You pretty much have to brace and support yourself with your face against the bedding, but you soon make a timid thrust into your 4th grade sibling's ass. Since you went in mostly dry you really tug on her insides when you move now. Bree still doesn't complain beyond an uncomfortable sounding moan. You work up to a steady pace, pumping into your sis while still taking it from behind. Once you find a rhythm Kylie seems determined to match it; she synchronizes herself so everytime you pull back she plunges into you. So not only are you fucking your sister, you look like you're eagerly rising your butt to meet the strap-on teen drilling you from behind.
You were already so horny, but between Bree's beautifully tight ass and Kylie tickling your prostate there's no way you could hold out even under better circumstances. Through clenched teeth and with a stiff neck you groan, then grunt, then yell into the sheets. You pump your way through your orgasm, dumping a heavy load deep inside Bree's anus. Cruelly, it's only after you start coating her insides that you able to fuck Bree more smoothly, your cum lubricating her ass. Even more cruelly, you've finished in Bree's ass but Kylie isn't done with yours.
"God, y-yeah!" Kylie screams, shakily humping into you. Kylie is a lot more into fucking you now than she was when she started. You continue to push against her thrusts, wanting to help her finish. As you think about this it seems weird, like it really shouldn't help, but you do it anyway. You justify it by continuing to slide your wet dick in and out of your sister's hole in the process, but the that vibrating dildo is hitting something just right inside you that, shamefully, makes you a willing participant.
"Rissy... Kiss me..."
She wants to kiss her sister? Fuck... that's hot. You wish you could see. Your assfucking by Kylie nearly ceases and the smacking of lips takes over from the schlicking sound of the dildo. Listening to the young girls behind you make out makes you wish your dick was at full strength so you could keep plowing into your sister to unleash another load.
"Mmmm-yeeAAH!" Kylie screams and pulls out of you. No longer impaled on the strap-on, you immediately roll away to the side freeing Bree as well. It's only as you part that you notice how hot and sweaty you are, the smell of sex beginning to permeate the air, your asshole sore.
Rolling onto your cuffed hands, you push yourself into a sitting position. Kylie has flopped onto her back gripping her dick with both hands and humping the air. She's actually humping the inside of the strap-on from the look of it, the buzzing and vibration still audible. Your sis meanwhile isn't moving. She only plants the top of her head down so she can peek through her legs. The hole you just vacated is still closing, her hand still pressed tight against her pussy. Larissa sits attentively beside Kylie looking at her big sister with adoration, but also with worry. She's probably never seen someone orgasm before.
After her initial outburst, Kylie doesn't make a sound. Shaky, trembling gasps for air are all that she manages while pulling and twisting the rubber cock attached to her. You all silently watch her, waiting for her to come down from her high. But she doesn't. She only gets more frantic. Until she remembers that she can turn off the vibrator. The flick of that switch brings a groan of relief from the small teen. The stimulation over, she relaxes over the edge of the mattress, her dick still pointing straight up as if contradicting how spent she is.
"You're okay, right?" asks Larissa. Kylie just nods.
"Can you please uncuff me now?" It's hard to keep the irritation and anger out of your voice, even though you just came which usually mellows you out.
"Why? So you can finish with me?" fires Kylie, quick to recover all of a sudden "Or so you can screw my sister next? No way."
You open your mouth to reply but find you don't have the words. Maybe you took this too far. It's hard to stay in control when you get so riled up. You swear that Kylie wanted it, but maybe not You spot Bree with her head up staring at your hands bound behind your back. She looks surprised but unconcerned. According to Kylie you deserve to stay like this, although the pounding your ass just received sure feels like enough of a punishment.
"I'm in charge of this sleepover now," Kylie continues, undoing various snaps and straps on her strap-on. "You're going to stay like that until I say so. Maybe, if you behave, we won't throw you outside."