RichardSean went from a blissfully erotic half sleep to terror filled wide awake when Mandy screamed in her orgasmic release. He tried to yell for Sandy but no sound escaped his lips, and as his eyes made contact with the gorgeous amazon straddling him his desire to do so also left him.
Sean knew deep inside himself that this growing muscle goddess was Mandy, Sandy's older sister and that he should be fighting to get her off, but his body was betraying him. Mandy's mouth curled into a devastating smile as she rode the waves of her orgasm and when she opened her eyes they seemed to bore right threw Sean. Leaning closer to him so her lips brushed his cheek Mandy cooed in an ultra sexy, deeply feminine voice.
" That's right Sean don't fight me, just relax and let me take you were you've never been before."
As she spoke Mandy again started to ride Sean pressing him deeper and deeper inside her and with every thrust more and more power flowed into her, making her bigger, stronger and more intoxictingly beautiful!
Sean couldn't help staring at Mandy as she drove herself onto him again and again and got bigger and bigger and sexier and sexier.
" Mandy!" he struggled to whisper as he forced his eyes to look away from the hypnotically attractive behemoth.
" You cant do this Mandy!" he blurted out trying to resist looking back at her.
" I love your sister and I can't betray her this way."
"Ah Sean " Mandy said as she turned Sean's head back to looking at her with her now huge gorgeous hand.
"I need you Sean! I need you to give me all the power I've stolen tonight. But there's no reason we can't both benefit from this. You see I took a bit more from some of the guys then I really want so I'm going to give some to you. I think it's only fair don't you!"
With that Sean felt a warmth flowing into him from Mandy and although he knew he shouldn't he looked down to were Mandy was rhythmically grinding herself on him, every time she moved he saw his cock getting bigger and thicker, he had never been small but now he was growing to porn star size and more!
Just then Mandy pressed herself tightly against him almost crushing him with her new weight. She cupped his head in one hand and kissed him like he'd never had anyone kiss him before. She was in command , she was the dominant partner as she forced her tongue deeply into his mouth forcing him to kiss her back. Breaking the kiss off she pulled on his lower lip with her teeth as she withdrew and then nibbled on his ear and softly purred into it.
" Oh you like that don't you Sean." she said as she peppered him with soft little kisses each of which seemed to leave a tingling sensation.
" Oh yes you sure do and so do I. Take a look at how much I like it Sean, take a long hard look at me!"
As she said these last words Mandy cupped Sean's head in her now massive hand and tilted it up so he could watch her growing body!
Sean couldn't believe how big Mandy was getting, she was already as large as Sandy and swelling larger and larger. Her tits were the size of volleyballs and being pushed forward on massive slabs of pectoral muscles. Her stomach looked like a cobblestone road, the muscles were so large and pronounced. Mandy's lats were growing like wings opening on her back while her shoulders were wider then an axe handle and filled with cannon ball like muscles! All this Sean took in in only a heartbeat but his heart almost stopped as he gazed upon the angelic features of her face. Sean's vision blurred as he was almost mesmerised by her beauty.
It was at this moment when Sean had almost completely succumbed to Mandy's new and rapidly improving charms that he saw the powerful hand of Sandy close around a huge swath of Mandy's golden like locks!.
" Get the hell of my man you freakish BITCH!" Sandy said yelling the last as she ripped Mandy from Sean's lap and throwing her clear across the room and threw a partition wall!
Sandy knelt down beside Sean her hair still wet from the shower and gently rested her hand on Sean's chest.
" Are you OK baby!" she said in a soft gentle voice.
Sean stared up into her loving face and turned away in shame.
" I'm so sorry Sandy… I thought… I thought I was dreaming and that it was you but it wasn't and I couldn't help myself."
"It's OK Sean, I saw enough to understand you had no choice, but who is she and how did she get so big!" Before Sean could answer the loft was filled with the deep melodious voice of Mandy as she walked back threw the hole she'd just made in the wall.
" I think I should answer that question don't you Sean!
I'm your older, wiser and now oh so much better looking sister you silly little girl" Mandy said as she brushed of pieces of plaster from her prodigious breasts.
"And as for how I got like this don't you recognise this pretty little bauble I purloined from you earlier!" As Mandy said this she flexed her massive pectorals, lifting and separating her cavernous cleavage to expose the blue necklace to the two lovers.
"You thief!" Sandy shouted at her sister."I let you stay here whenever you need to and you reward me by stealing my stuff!
" Not only your stuff tonight dear little sister" Mandy said as she flexed her massive muscles showing Sandy that she now was larger then her.
"I've been quite the thief tonight. I've stolen from so many people that I've lost count, and I've barely begun to fence my stolen property. So if you don't mind I need your little sex toy their to achieve the maximum return on my loot!" With that Mandy walked towards the two with an erotically arrogant gait and brushed past Sandy reaching for Sean.
What happened then was so fast that Sean barely saw Sandy spin and grab her sisters forearms pulling and lifting her backwards. The two then began to grapple with each other spinning and twisting, both trying to gain an advantageous position. As the two Titans struggled with each other blue electrical sparks started arching between them. Sean couldn't believe what was happening as a halo of blue sparks encompassed the two combatants completely. He hesitated for only a second and then reaching under the bed he pulled out the baseball bat he always stashed their for emergencies. Stepping up to the two amazons Sean reared back and drilled Mandy across the back sending vibrations down the bat and along his arms so strong he almost dropped it. Mandy seemed to buckle a bit allowing Sandy to gain the upper hand pushing Mandy more and more off balance. Gritting his teeth Sean started to swing short chopping stroke at Mandy's thighs and hamstrings trying two break her legs but the bat just kept bouncing off her as though she was made of concrete!
Mandy on the other hand was getting quite a kick out of the little guy trying to protect her sister, in fact she was finding the slight stings of his bat quite stimulating.
Sandy realised she was in the fight of her life as she felt Mandy start pushing back trying to regain her balance!
She now knew that her sister was defiantly stronger then her! God how many had Mandy absorbed she thought as she strained to hold back the stronger woman with leverage moves she'd learnt in self defence.
Sandy realised her cause was lost as she heard Sean's bat slamming away at Mandy but instead of pain she heard an erotic moan escape her sisters lips. Before she could yell at Sean to stop she felt her sisters arms swelling in her grip and then watched in horror as Mandy's body started to grow larger and larger at every strike of the bat!
Sean"s arms were tiring when the bat snapped in his hands, holding the now broken handle he stared up at the seemingly much larger Mandy!
For Mandy each slap of Sean's bat was sending small orgasms cascading threw her body and with each cascade she grew and she grew. Until just as Sean's bat splintered against her hard muscles she swept her sister effortlessly into the air and hurled her against the brick wall on the far side of the room. Mandy turned toward Sean effortlessly snatching him into the air and embracing him in a vicious kiss. " I'd say your my little sex to now don't you think Sean." Dropping him to the ground she walked over to were her unconscious sister lay sprawled against the wall and lifter her up into a bear hug. Blue sparks started to ark from Sandy encompassing Mandy in a Blue Cocoon of energy as Sandy's body shrank down to her former size losing not only her muscles but her breast size as well. When it was over Mandy turned to Sean in time for him to see her eyes radiate an intense cobalt blue energy the same colour as the now glowing necklace. The stone then began to dissipate, slowly sinking right into Mandy! In moments it was gone leaving only the chain around her neck and a hungry look on her face.
That's it for now, I'll try to get the next chapter out in a more reasonable timeframe.