Your little sister smirked as your eyes met her young, tight pussy. It now easily doubled your size as it dripped in anticipation for what was to come...
"Hang on, I have an idea. Hayley, watch him and make sure he doesn't escape." Melody says as she steps off the bed and onto the floor, out of the bedroom door and down the hallway.
Hayley looked down at you and smiled, she bent down and whispered to you "Just a heads up, I have plans for you when Melody's done with you Alex" she stood up again and turned around, presenting you with a full view of her giant ass. It jiggled as she swayed side to side as she stare back at you with a smile as she bent over and grabbed a cheek "For example..."
You stare into Hayley's brown anus as it puckers at you, big enough to swallow you whole without hesitation.
"What about the rules Hayley??? What happened to keeping us equal" you questioned her. She chuckled as she loomed her monsterous ass above you.
"None of that matters once Melody falls asleep Alex... Besides, you were already cute big, and now, I can have you all to myself small" shit you remembered. How could you be so stupid. This wasn't just a hangout, it was a developing slumber party...
Hayley bounced her ass a couple times to get her point across before she turned around and winked at you with a mischievous smile. You overhear footsteps approaching the room, you look through the doorway to see your sister approaching down the hall with one hand behind her back. Hayley gives you one last side glare, almost as if to say 'Buckle up'
Your sister closes the door behind her as she enters the room, still concealing what she's holding behind her back as she climbs back on the bed, straddling you between her legs once again. You stare straight up to see your sisters pussy, continuing to swell in anticipation. You try and peer behind her to see what she's brought to aid your torture, but before you can see, she reveals it to you.
"Look what I've got big bro!" she holds up a large purple dildo covered in sparkles. Your heart sinks into your stomach and your soul crumbles. You know what this means...
"Hehe isn't it BIG, perfect for such a LITTLE prick like you. I bought it from Spencer's with some Christmas money I hid from mom. Have you seen it hidden in the back of the towel rack in the bathroom before?" You had. You'd bumped into it once looking for a hand towel once, but you'd thought it was your mom's. Never in a million years did you think you'd see it now, wielded by your horny, colossal, 13 year old sister...
Hayley sat in the desk chair as she stared at the dildo, she laughed hysterically in secondhand embarrassment of what was to come for you.
"How about I get you comfortable big bro" Melody's hand slammed down on the surface around you as she picked you up haphazardly, grasping your inch tall for in her palm opposite the giant sex toy. She shifts you between her thumb and index finger as she brings you down to the purple monster now positioned on the bed below her.
She dropped you down on the giant rubber head of the dick as she looked down and studied her developing plan... "Hmmm, this looks fun, only problem is..."
"What?" You asked
"You see, when you fucked me into Hayley, I came off your dick pretty quick, leaving me stranded in her, and, eventually your juices. I nearly drown!" You were having trouble seeing what she was getting at... "So if I'm gunna fuck you into my pussy with my toy, I'm gunna need some 'insurance' that you can still continue to participate afterwards"
Her pussy began to litteraly drip from the multitude of ideas she had in store for later. "I know what we can do to ensure your safety, but im gunna warn you big bro, you won't like it"
She pointed at her desk drawer next to Hayley and ordered some scotch tape. Again, you saw it coming from a mile away, as she cut a tiny piece and stuck it to your 1 inch form as she fastened you to the head of her toy.
"Look on the bright side bro, I'm doing you a favor, now you won't have to worry about getting stuck inside your little bitty sisters pussy haha" she chuckled at you as she positioned her massive sex against her toy, rubbing you against her lips...
"Well let's stop the antics and get this show on the road, I've been waiting too damn long for this. Good luck little shit, youre gunna need it where your goin!" She snarked. Without warning she dropped her tight pussy down onto the head of the cock as she pushed herself onto her toy.
Immediately her juices hit you, she wasn't kidding, she's been ready for this. Your little sister continued to force the cocks girth into her tiny pussy. Her walls so tight, you could tell she was still new to the dildo, and her pussy wasn't big enough yet...
It didn't stop your giantess sister from fucking you inside her. For the next 20 minutes your sister railed herself at your expense. You got a front row seat to your siblings messy masterbation session in the name of payback. She bounced for what felt like forever as you were affixed to it's surface. The worst part was, you couldn't help but be turned on by your brutal punishment... That was until the tape came loose.
Ten minutes in you noticed you started to feel a bit loose on your carnival ride from hell. You looked to your right and saw the tape which kept you stuck this whole time was beginning to break away from the dildos cum soaked surface. Soon enough the adhesive gave way, leaving your fate up to your grip onto your sisters 12 story sex toy as it rammed into her dripping wet chasm. A grip which was short lived.
You couldn't hold it, you slipped off the cock and fell deep into your baby sisters pussy, drowning in her juices as you flew into her hole further. Her shaking and moaning could be heard, even to you all the way inside her as she approached her finish. Suddenly, a tidal wave of juices hit as your sister climaxed.
You were forced from Melody's giant pussy on to the bed below with the force of a moving car. You look up as you watch your giantess sister tumble over on her side, short of breath. You lay staring at her sweaty naked body, dwarfing you 60 times over...
She rolled over as her eyes met you and her toy not far from you. She rolls her dildo besides you as you lay on the bed. The 12 inch dildo easily outsized most office buildings from your point of view.
"So small, so pathetic, my once big brother, now no match for his little sisters cum toy. Remember this 'little bro', because if you break the balance again, I'll make you wish you were still my dildos pet"
The thought of what she could do to you at this size made you shiver in fear. Yesterday your sister was a sweetheart, today, she still was, but a new world of fear lived in what she was capable of if wronged.
Hayley looked away from her phone and focused on you guys again "Well, now that that's finished, what's next on the agenda"
"Yeah I'm done punishing you Alex, I trust you'll play fair now" Melody tapped some buttons on her bracelet, you notice the lights on your bracelet change back to white. You begin to grow yourself back to size.
You stand up next to your regular sized little sister and her friend. They both eye your cock, hanging fully erect. Your sister looks away and blushes, Hayley has no shame and drools at it's sight "So what's next, how about we do some..."