If you won't - he will

Thus far, Maddie had been incredibly supportive of her boyfriend Ken's desire to be a hot eighteen year old girl just like her.  She'd helped Ken obtain the ingredients he needed for the Elixir - then helped him distil and prepare the solution and observed cautiously as he'd tried it for the first time.  Watching the love of her life moan and writhe in pleasure as his masculine body transformed to become like hers - soft, curvy, pretty and feminine - had been weird but also kind of hot.

Kenzie, as she now wished to be known, had wanted Maddie to show her everything about being a girl.  She'd insisted on makeup and clothes tutorials and they had got their hair and nails done together. Hanging out with Kenzie had been kind of cool at first, it was actually like having a new bestie to play with. Kenzie was giggly, hyper-feminine and full of fun.  It was like hanging out with a better version of Ken - though of course, Maddie loved her boyfriend and was looking forward to him coming back soon.

After all, Ken had promised he'd only want to do this a few times just to know what it felt like. As such, Maddie thought her boyfriend just needed to get this girl fetish out of his system, she had even convinced herself that it would be healthy for their relationship, as he would know more about what it was like to be a girl and thus more empathetic and loving towards her.

But once wasn't enough for Ken.  Now he had a taste for Elixir and girldom, he wanted to transform every weekend and hang out with Maddie as her cute, flirty, bestie.  At first Ken had just borrowed Maddie's clothes and makeup, but by now he was amassing his own collection of stuff and as the weeks went by, Maddie began to realise that Ken was becoming more and more dominated by his female persona.

The slightly shy and inexperienced girl Ken had first transformed into was, by now, acting like a ravenous flirty bitch when she transformed.  After only a few weeks of practice, Kenzie was probably better at doing her makeup than Maddie even was and she had a self-confidence and arrogance that made her incredibly hot.  She acted more girly that Maddie and had begun to take charge in their relationship.  It was starting to feel like Kenzie was the Alpha girl and Maddie was her submissive best-friend.  Try as she might, Maddie began to find herself falling into a pattern of submissive behaviour around her manipulative new girlfriend.

She was shocked at how bitchy and mean Kenzie was becoming.  The other girl saw herself as superior to most people and she had a slutty, 'I don't give a fuck' kind of attitude that really worried Maddie.  Worst of all, Ken refused to have sex with her now unless he was Kenzie.  He seemed to have no libido at all as a man, but as Kenzie he was constantly masturbating, fingering himself and insisting Maddie lick him out.  The first time they made lesbian love, it was really hot - but now Maddie was starting to miss Ken's cock and she also didn't like the way that increasingly it was her having to eat Kenzie out and make her cum all the time.

Whenever Kenzie turned back to Ken, he would argue that Maddie had it all wrong and that he wasn't trying to be a bitch on purpose - but despite his sweet protestations, Maddie's patience began to fray.  Eventually she'd had enough.  She told Ken she wanted him back in her life and she didn't want to see Kenzie anymore.  "I want my man back and I'm sick of living in the shadow of Kenzie.  You seem to love being her more than you love me.  You need to choose!"

"Babe, don't be like that.  Tell you what, I'll go back to Ken permanently, but lets have one last weekend together as girls.  Pleeeeease?"

Maddie relented.  If this was the last time Ken was going to become that bitch she could live with it, so she allowed him to take the Elixir and transform.

Maddie watched Ken become Kenzie with a slightly nervous feeling in her tummy.  Ken seemed to be enjoying the transformation a little bit too much, giggling and moaning as he stretched out his limbs and his bones popped and his skin softened.  "Ohhhh yeah, I'm soooo fucking hot," groaned Kenzie as her hair lengthened and her nails grew out, "Yeah - I love being a hot girl."

After transforming and doing her makeup, Kenzie sat with Maddie and she seemed much nicer than she had been recently.  She almost seemed apologetic about the bitchy way she had been acting and as they sat on the bed together, the giggling bitch reached under the bed and pulled out a shopping bag she'd hidden there.  Maddie wondered if it was a present to make-up for things.

"Maddie, I'm sooooo sorry that you think I'm being a bitch to you, and I'm sad this will be our final weekend together.  Since we won't see each other again after this - I've bought you a present.  You see, there's something I've been wanting to do for a while and this is our last chance to do it.  Go on and open it."

Maddie curiously took the bag and took out the wrapping.  She reached inside feeling something soft yet firm - plastic to the touch... or was it rubber?  Curious she yanked it out of the bag and gasped as her hand emerged carrying a ten inch strap-on cock.

"WHAT THE FUCK IS THIS?" snarled Maddie as Kenzie giggled.

"Well... since I became Kenzie the one fantasy I've not indulged is getting fucked. I love how you lick me out, but I wanna know how it feels to be penetrated and fucked by a big hard cock. Soooooo,  I want you to put on the strap on and fuck me like a little whore."

"Ken... Kenzie... I am NOT going to fuck you with a strap on.  Forget it!  It's disgusting and my brother is in the other room next-door.  I don't know if you noticed but it's also the middle of the fucking day."

Jason, Maddie's hot quarter-back brother was next door listening to his music.  He had been sniffing around Kenzie for the last few weeks curiously.  He of course had no idea that the new hot girl his sister was hanging out with was really her boyfriend.  Ken and Jason had never got on well, but Kenzie and Jason got on almost a little too well.  Part of Maddie's annoyance at her boyfriends alter ego was the way she kept flirting with Jason... it made her feel very uncomfortable.

"Hey - listen bitch," pouted Kenzie in annoyance as Maddie threw the strap on down and turned her back on her.  "I'm giving up being a girl forever after today and the least you could do is help me live out my final fantasy.  Ever since I became Kenzie, it's like something switched in my head and I have all these new thoughts and desires.  I'm definitely bi-sexual now... I think guys are hot, and I've been having some pretty dirty fantasies about them. I just want to imagine you're some hunky guy pounding my pussy and get to know what a cock feels like inside.  If you love me you'll do this for me."

Maddie couldn't believe this.  After all these weeks of being bossed around by this slut, Kenzie was still trying to call the shots.  Clearly she still only cared about her own selfish pleasure.  How dare she try to passively aggressively control her.

Maddie heard the words coming out of her mouth with venom. "Well you're a dumb, little, bitch aren't you?  I don't want to fuck you - I want my man back.   I've hated you right from the beginning, Kenzie, there's something really not right about you.  I hate what you've turned Ken into."

Kenzie's eyes flashed with anger and she drew herself up.  "Well, well, well.  Finally I learn your true feelings.  Seems you're jealous I'm a better girl than you ever were.  Since I transformed I've been realising more and more just what a jealous and dumb little bitch you actually are.   You just can't stand it because I'm becoming more popular and successful as a girl than you ever were."

Her temper flaring, Maddie slapped Kenzie across the face, her eyes burning with pure hate. "I never want to see you again Kenzie.  I want my boyfriend back!  You are finished!"

Maddie went to slap Kenzie again, but to her horror Kenzie's arm shot out and caught her wrist.  The other girl seemed unnaturally strong and her face was a snarl of emotions as she leaned in close and hissed into her face.

"You stupid bitch.  All these weeks I've been trying to control all these wicked thoughts and desires.  I've tried to make Kenzie be a good friend to you, stay loyal to you... but now... now I realise I should just give into my darkest desires.  You have no idea how long I've just wanted to succumb fully and give myself over to being a bad girl.  The truth is Maddie, I LOVE being Kenzie and I don't ever want to go back to being a boy again.  If you won't give me what I want... what I need... then I'll find someone who will."

Releasing Maddie's wrist, Kenzie stood up and walked to the door, disappearing outside.  Maddie sat on the bed, tears in her eyes as she realised she'd just pushed her boyfriend over the edge.  What had she done?

Meanwhile, out in the corridor, Jason had come out of his room when he heard raised voices.  Seeing Kenzie he cleared his throat as she approached.  She looked really pissed off, but when she saw him her eyes seemed to brighten and a slutty smile appeared on her lips.  Her body language immediately became inviting, so he strutted over and grinned as he eyed her up.

"You and my sister arguing?  Anything I can help with?"

"Mmmmh, the only thing you can help me with Jason... is by giving me what I've wanted for all these weeks.  We've been flirting pretty heavily so lets stop playing games, do you wanna fuck me?"

Jason grinned,  "Wow, you're pretty forward.  I don't think I've ever had a girl be that up front with me before."

"I'm not like other girls," giggled Kenzie as she grabbed her tits and began to grope and feel herself up.  "I know you wanna touch my titties too.  Your sister has really pissed me off and I wanna get my revenge by fucking you.  I know she irritates you too, so I assume so you won't have a problem with that... right?"

Moving forward Kenzie grabbed Jason and kissed him hard, guiding his hands down to her perfect ass.

"Ohhh fuck, no - I don't have a problem with that."

"Good... come with me then," giggled Kenzie leading Jason by his hand into his own bedroom.

Kenzie straddled Jason and slid her top down.  They began to kiss and makeout, his hands all over her tits.  As they moaned and Kenzie ground on top of Jason she began to get hornier and hornier.  Cheating on that slut Maddie was going to feel so good.

As if on cue, the door opened and Maddie walked in.  She'd heard the sounds through her wall and she had to see it for herself.  As Kenzie smirked at her, Maddie ground her teeth together.  Her boyfriend was gone and this bitch was all that remained.

"Last chance Maddie... I'll come next door with you if you agree to what we discussed earlier.  Otherwise Jason here is gonna give me what I need," moaned Kenzie as she gyrated on his lap and let him touch her up all over.

"FUCK YOU...YOU BITCH," spat Maddie turning on her heels and storming out.

"Mmmmh, that's too bad," purred Kenzie,  "but to be honest - I kinda wanna fuck the real thing now anyway."

Her hands went down to Jason's pants which by now were straining rock hard with his big cock.  Giggling, Kenzie pulled them down and sliding off his lap allowed him to stand up so she could kneel in front of him.  His dick was huge and hung in front of her face.  She felt so horny and wet, the thought of what she was going to do was really turning her on.  She wondered if she should tell him this was her first ever blowjob?  She also wondered if she should stop?  This was her last chance to end this and go back to being Ken before taking a step she could never fix.  If she fucked Jason her relationship with Maddie would be ruined forever.  Could she live with that?

Of course she could... if anything giving into being a bad bitch just made it feel better.

"Fuck that bitch, if she won't fuck me... he will."

Kenzie had watched enough porno to know how to suck a cock in principal, but doing it in real life was still an interesting challenge. Remembering to maintain eye contact, she knelt as comfortably as she could and slowly licked the tip of Jason's cock, using her hands to cup and stroked his balls and work the shaft of his penis.  She felt a moment of fear and panic as she slid her lips around the salty tip and felt his cock slide deep into her mouth - but remembering not to panic she relaxed her jaw and took his cock as deep as she could.

She felt pride as she heard him groan and a desire to please him, to make this cock all hers, filled her.  Now she understood why some girls liked this so much.  It felt like Jason was under her control... even though she was the one on her knees, his cock... his most vulnerable organ was in her mouth.  She could make him cum just doing this... she could make him feel so good.  It made her feel hot and sexy to know that this cock belonged to her now. 

"Oh fuck Kenzie, that feels so fucking good," groaned Jason as she got more and more confident and began to gag on his dick as she tried to take it as deep as she could.  Stars swam in front of her eyes and she felt her pussy get wetter and wetter as she gave into her primal instincts and worshipped the dick in front of her.

"St...stop," groaned Jason and for a moment Kenzie was worried she'd done something wrong, but he gently guided her up and indicated she should lay on the bed.  "If you keep it up like that baby, I'm gonna blow my load prematurely.  Lay back and let me return the favour."

Kenzie moaned in ecstasy as Jason positioned himself between her legs and began to lick her pussy.  His tongue went deep inside and he moved it up and down quickly, flicking it up to lap against her clit every now and then.  She squealed and writhed in pleasure, her pussy getting wetter and wetter as she squeezed her tits and groaned happily.

"Oh Jason, you're so good at that... ohhhh fuck, ohhhhhh!  Shit... I can't take it anymore, please fuck me... please!"

"Are you sure?"

"Yes... yes. Please, I need it so bad.  Just go gentle to begin with..."

Kenzie's tummy was full of butterflies.  This was even scarier than sucking cock.  What was this going to feel like?  What if she didn't like it?

Positioning his dick outside her tight hole, Jason lined his cock up and slowly pushed it inside her.  Kenzie's eyes widened in wonderment and pleasure at the feeling of insertion, the feeling of his dick going inside her body.  It was a wonderful sensation, she could feel it stretching her pussy out and as he began to move his cock in and out of her, the pleasure began to build.

"Ohhhhh fuck yeah, fuck me Jason.. ohhhh I love it."

Kenzie was in heaven... this felt just as good as she had hoped it would.  She was getting a good dicking and she loved every moment of it.

"Shit Kenzie, you're so fucking tight," grunted Jason as he sped up and wet slaps began to fill the room.  She moaned in continuous pleasure, her tits bouncing as he banged her harder and deeper.

"YES OHHHHH YES, FUCK ME BABY!"

"Oh fuck, careful... I don't wanna cum in you... ugghhh, and it feels too good."

Wrapping her legs tight around Jason's waist, Kenzie giggled and flipped him over onto his back.  "Mmmmh, how about I ride you?"

"No... wait... I can't pull out if you do that... I can't cum in you, my sister will kill me."

"Mmmmh, what are you some sort of pussy?" giggled Kenzie as she rode him and began to thrust her own pussy up and down on his dick faster and faster.  "Cum inside me... I wanna know what it feels like, OHHHH YEAH!"

"Ohhh fuck, you bitch... noooooo, I can't uggghhh hold it," moaned Jason as Kenzie giggled like a maniac and bounced up and down on him urging him to give in. 

"SHITTTTT!" groaned Jason as his dick erupted and he pumped his cum deep inside the slut on his dick.  He had never cum so hard in his life, it felt like her pussy was sucking the cum out of him and he never wanted it to end.

"OHHH YES, fill me up, I love it" screamed Kenzie, having her own orgasm and rubbing her clit as she felt hot cum fill her up. 

"Oh fuck, you bitch - that was so wrong. I hope you're on birth control," groaned Jason as Kenzie slowly stood up and she smiled as his cum dripped out of her pussy to land on his stomach.

"Oh don't worry baby, I don't think I can get pregnant... ummmm, well I don't think so anyway."

Panting in the bed, Jason watched as Kenzie cleaned herself up a little and began putting on her clothes. 

"Damn, you're such a hot slut," groaned Jason.

"You're right... I am a slut," mused Kenzie,  "I tried being good, but I understand now that I'm destined to be a bad girl.  Thanks for helping me realise it."

"Will I see you again?"

"Well... this was meant to be my last weekend, but... I think you're going to be seeing a lot more of me.  I think now me and Maddie fell out, I'm a free agent.  Bye baby, be seeing you."

As she left her lovers room, Kenzie smirked as she heard Maddie sobbing next door.  Whistling happily she thought of all the unrestrained fun she could have now she was free of Maddie.  Ken would only obey one woman now and that was her.   From this day forward, she was going to do everything she wanted and live her best life.  Life was going to be great.

The End.