Your step sister Ashley had always been a bit of a princess and a brat, ever since your dad remarried she had been a constant inappropriate annoyance in your life. She flirted with all your friends, constantly nagged you about not having a girlfriend, and overall made your life a living hell. She was a little younger than you, attractive in that skater girl punk way, wearing tight clothing that showed off her tiny curves. All your friends thought she was a smoke show, but you couldn’t see her as anything other than a nuisance.
“When are your friends coming over?” she asked as she barged into your room taking selfies and bouncing all over your room touching your stuff. “I can’t wait to see them, and see which one I can make squirm” She was blunt, using her feminine ways to make all your buddies squirm in their seats as she constantly touched, and toyed with them in front of you. “Hey, what are these Hello Kitty headphones doing in your room? Did you finally grow up and get a girlfriend?” she laughed at you knowing the answer all ready. What she didn’t know, what she couldn’t have possibly known, was that you had placed those headphones in her line of sight for her to grab up. She was always stealing your stuff without your permission and you knew these would grab her attention. You half assed an attempt to stop Ashley from taking them from you, but she quickly grabbed them and walked out the door. Perfect, you had designed those particular headphones to “enhance” your annoying little step sister, to make her more accommodating to you. If she put them on, any music she listened to would first be filtered through your BIMBO tech synthesizer, slowly filling her head, and her body with addicting airheaded BIMBO waves.
After another annoying night of Ashley parading around you and your friends trying to hang out, wearing little more than a tan crop top, and some PJ bottoms flashing as much of her body to the guys as she could, you said goodbye to your infatuated buddies and got ready for bed. Not before peeping in to see if Ashley had put on the head phones.
Just as you expected, she had used them in her nightly routine, and just as you hoped she was already starting to show signs of changing. The tiny crop top, was already stretched out to the brink as her breasts slowly swelled through the cup sizes, laying sprawled out in her bed, you could see she wouldn’t be able to resist wearing these head-phones often as she was already half naked. One of the intended side effects of the BIMBO tech was a need to wear as little clothing as possible, accented by a swelling of all her curves. By morning she would be addicted to the idea of tighter clothing, or wearing nothing at all. She would also grow more and more flirty and subservient to everyone around her, including you. You stroked your growing cock, imagining all the ways you were going to enjoy your new step sister!
A few weeks had gone by, the changes to her body had been received normally, your family chalked it up to a late growth spurt, and everyone was happier that the two of you were getting along more and more. Ashley had even taken to hanging out with you alone at times, seeking to connect more with her Big Bro, as she had begun calling you. What your family didn’t know was slowly the two of you had been getting closer than siblings. Ashley couldn’t help but touch you these days, when she wasn’t in your lap bouncing up and down and asking what the two of you were getting up to today, she was sneaking in to make out with you every chance she got. It had started innocently enough, one night after a pleasant night hanging out with your friends, they had all started to appreciate Ashley now that they could get a handful of her ass and breasts as she flirted all night. Ashley wanted to stay up and watch a movie after they left. That had led into your first make out, her pressing her now curvier body into yours, breasts melting against you as she shuddered at the kiss. “I don’t know what I was thinking before” she mewed into your ear, “You are a great step brother, any girl would be lucky to have you” She moaned as your hands went to her curves, your cock growing up between your legs and pushing into her hips as she slung herself over your lap, mounting to grind against you. “I am lucky to have you” she moaned as you two furiously went at each other kissing and exploring each other's bodies.
Days later the two of you would go out to the beach so that Ashley could show off her new swimsuit. She had never stopped using the headphones, and was caught by yourself many times, laying in her bed, hand down the front of her panties as she played with herself listening constantly to the BIMBO synthesizer. She had never stopped swelling, and your parents had commented on how much money they had been spending on new clothing, but Ashley didn’t mind. In fact she had grown to love how much you stared at her huge breasts. Constantly finding ways to display them for you when no one was looking. The beach trip was just another way of getting her mission accomplished. As you both laid there in the sun, She would just smile over at you and letting out a long sigh, letting her massive tits heave with the motion. “You know, I don’t think this new bikini really fits me, do you?” She leaned forward and let her hands wander over your body trailing down to the tenting of your swimsuit. “I think you should take me out to go buy another one, I'll even let you help me put it on in the dressing room” she moaned as she gripped your cock in one hand and began stroking you on the beach under your umbrella. “We have been toying around with it for awhile Big Bro, but I need you, I need you badly. The blow jobs, and groping sessions have been great” She moaned as she said, “But I need to feel you inside me soon, or I’m going to lose it”. She started to stroke you faster, getting you closer and closer. “Please, please promise me I won't have to wait forever, you keep teasing me every day. I can’t wait much longer or I am going to come into your room and take you myself!” at that, you could feel yourself cum hard in your shorts as she gripped your cock and milked it for all it was worth. She was right, you had been teasing her, waiting till she was unable to resist any longer, you had hoped she would have broke already and would have woken you in the night for sex, but you had stayed patient. Letting the tension rise to a fever dream. “We just have to wait a little longer Sis”, you growled as she let your hands wander over her skin, teasing her nipples through her bikini. Soon, I promise, soon.
A few days would go by where your parents had to leave for a trip and trusted the two of you to stay home alone. Ashley had exploded out of all the clothing she had in the past week since the beach, your parents were at their wits end with her sauntering through the house barely wearing anything. They had caught her twice flirting with the mailman, and already banned her from going out in public till her growth spurt was over. She constantly masturbated throughout the day, moaning loudly when ever you were close, and even flirted with your father at times. This trip was a chance for your parents to take a break from all this. As they left and you waved from the front door promising you would take care of your step sister in this trying time, you closed the door and began searching the house for Ashley. Finally, you had waited long enough and you couldn’t resist any longer. Cock raging in your pants you bounded up the stairs to Ashley's room.
Greeting you as you opened the door, was the largest set of tits you had ever seen in real life. Gone was the tiny punk skater girl, before you sat a bombshell, tits on display and a look in her eye of pure lust. She had had to start buying specialty bras as her breasts had inflated well past normal bra sizes, but they wouldn’t arrive for a week. Her pants wouldn’t fit any longer as her hips and ass had plumped out around her, a perfect heart shaped ass sat beneath her as she eyed you up and down, stopping on your cock. You finally had stolen back your headphones and locked them away, halting the growth for the time being. Maybe some of your classmates could use the upgrade, maybe even your stepmom if you got horny enough, you causally thought as you walked towards your step sister, pulling your cock out and letting her watch as you growled and slowly grew harder and harder.. Ashley was yours, the two of you would spend the week your family was gone completing your little science project. The two of you would spend all day fucking like animals till she passed out on top of you, only to find her teasing you awake with her tongue, her breasts pillowed around your lap as you woke up every morning wondering what your next moves were, when your family returned next week.
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