Chapter 1

Morty stared down into the vial of faintly glowing green liquid. He was certain he had finally perfected it. The first time he had used the love potion, almost 4 years ago, he had began a chain reaction that destroyed his old world. He had sworn off using any of Rick’s destructive inventions for love or sex but now he was getting desperate. Rick had left the family, once again, without any real explanation - simply stating that he would return and warning his grandkids not to mess with his stuff while he was gone. It had been 3 months since Rick vanished through one of his portals and Morty’s lust and boredom had got the better of him.

Since the first catastrophe with the love potion which turned the worlds inhabitants into freakish monsters, Rick had discovered the error in his calculations and had spoke at length on where it had gone wrong. Morty hadn’t paid much attention to his grandfather’s ramblings at the time but now that several years had passed, and he was no closer to seducing the love of his life - Jessica -Morty had decided to try it again.

In the 6 years he had been going on wild adventures with his genius, unstable grandfather, Morty felt he had picked up quite a lot of knowledge surrounding Rick’s ridiculous inventions. He knew he would never be able to compete with his grandfather’s godlike intellect but when he found the revised love potion recipe stashed away in the garage (amongst dozens of other insane blueprints and equations) Morty had been confident he could piece it together.

Now, 2 weeks since finding the potions recipe, Morty found himself with one, small vial of the luminous green liquid, and a perfect plan to use it.

Summer had finally had enough. She was tired of getting ignored, of big-titted bimbos stealing all the attention and stealing her boyfriends. Summer had thought going to college would be fun, that there would be constant parties and she would get laid whenever she wanted. But instead it was disappointment after disappointment, every guy who did show her a little attention would always end up losing interest and going off with another girl, and Summer knew why.

No it wasn’t because she was arrogant or selfish, or was too picky when it came to men (all things Morty liked to point out when Summer was annoying him). Summer knew the reason she wasn’t getting lucky was because of her flat chest. She blamed her mother, Beth, for this of course. Beth may have bigger breasts than her daughter but not by much and Summer blamed these genetics on her lack of success. Fortunately, Summer had an easy fix for her problem, a solution that had backfired terribly when she tried it several years ago but one which she was now confident she had perfect control over.

When she had first noticed boys weren’t paying enough attention to her due to her smaller than average tits, Summer had the brilliant idea to use one of her grandfather’s incredible inventions - the Morphizer-XE.

The Morphizer-XE was Summer’s favourite invention of Rick’s. It was a simple machine with dials and a lazer which could be set to change the size and molecular makeup of just about anything. For example, a bit of dirt could be turned into diamond, which could then be enlarged to the size of a house. However, Summer had no such plans. She just wanted massive tits.

The last time Summer had used the Morphizer-XE she had quickly lost control when stood in front of the machines lazer. Instead of simply making her breasts larger, Summer had turned herself into a freakish giant, trapping herself inside her parents garage (which doubled as Rick’s laboratory). The situation then escalated, as it inevitably always does, leaving Summer more than a little traumatised. However, it had been almost 4 years since that terrible day and Summer was ready to try it again.

Summer entered the family garage and flicked on the light. The fluorescent lighting buzzed and blinked into life as she scanned the dirty, cluttered room for her goal. She spotted it quickly, loosely covered by a tarp in the opposite corner. Summer placed her mug of black coffee on one of the shelves before discarding the tarp and wheeling the contraption into the centre of the room. Summer hated the taste of coffee but she needed a burst of energy and a pot had already been boiled in the kitchen.

She quickly plugged the Morphizer-XE in and set the dials to the necessary settings. Summer then set up the screen that the lazer would be pointing at - a screen made of a special material that would absorb the lazer beam whilst remaining uneffected - one of Ricks clever safeguards to keep the laser under control.

Summer switched on the lazer and watched as it fired a steady, yellow beam into the protective screen. She took a couple of deep breaths before moving onto the next step. In one smooth motion Summer reached into her tank top and whipped out her plain, white bra. She looked at the flimsy material and pulled a face at its measly size. What better way to test the Morphizer than by using one of her bra’s, she figured she would need a bigger pair anyway to match her breasts - if everything went to plan.

Gingerly, Summer dangled the right cup over the lazer and slowly, carefully, lowered it into the ominous, yellow beam. Instantly, as soon as the light came into contact with the white cotton, the right half of the bra began to balloon ridiculously, inflating 5 cup sizes in seconds. Summer laughed in relief as she adjusted the bra and moved the left cup into the beam. The same effect took place and soon Summer was holding one, massive bra that could comfortably cradle two ripe watermelons.

Pleased with the results, Summer tossed the bra aside and removed her tank top, leaving her naked from the waist up. She then adjusted the power cable to the Morphizer-XE so that in the all too likely event that history should repeat itself, Summer could kick out the plug and cut off the beam. Now that this was in place Summer took another deep, steadying breath before edging herself forward into the yellow light. She angled herself so that she was mostly side on with the lazer and could dip in and out of it’s effects. Just as her right breast neared the light Summer stared down at her chest and stated with as much confidence as she could muster:

“Goodbye pancakes, hello mellons...”

Morty finished applying his favourite cologne and adjusted his best yellow t-shirt in the mirror. He examined his appearance one last time before deciding he was ready to put the rest of his plan into action.

Morty hopped down the stairs and into the kitchen where he heard a familiar buzzing coming from the garage. He walked past the half empty coffee pot he had just boiled and into the adjoining garage. What he saw made him immediately freeze and his mouth drop open.

Standing before him was his older sister, Summer. But not the usual, ginger, flat chested, ordinary Summer he had grown up with. This Summer was naked from the waist up and had tits the size of beach balls.

“W-what the fuck Summer?” Morty gasped before immediately spotting the Morphizer sitting nearby. “You u-used that ... again? After what happened last time? You were turned into a m-monster!”

Summer was ecstatic with the results. Her tits were absolutely massive and surprisingly symmetrical. She had kicked out the plug the moment she was happy with the size and it had worked brilliantly. Well brilliantly except for the fact that her brother had just stumbled upon her half naked and he was clearly completely rattled. Morty had nearly completely gotten over his stutter in the past couple of years and it was only real shock that would bring it back.

“Listen, Morty, I know the lecture you’re gonna give me but it’s done now. I figured out how to use it safely and I’ve pulled it off. I hated my boobs and now they’re perfect!”

Morty hesitated and licked his lips. His sister’s tits were incredible. He had seen many creatures with massive breasts in his travels but none were as amazing and tantalising as Summers. They bounced and swayed slightly with her breathing and Morty was practically hypnotized by them. He did finally draw his eyes away to scan the room and give himself a moment to think and take in what had happened. Except as soon as he pulled his eyes away he noticed something even more shocking.

“Uh, what the hell is that, Summer?” Morty pointed a finger to the shelves next to the Morphizer and his hand was literally shaking with trepidation.

“What?” Summer snapped before following where his hand was pointing. She felt an irrational annoyance that her brother had stopped paying attention to her massive tits so quickly, even though his gaze should have grossed her out it actually had excited her. “It’s a mug, Morty, you know the thing for tea and coffee. All the shit you’ve seen with Rick must have melted your brain if you find that so surprising.”

Morty ignored his sister’s scathing tone and gulped loudly in an effort to calm his nerves.

“What’s in the mug, Summer?” He croaked through a suddenly tight throat.

“Eh, coffee dumbass,” she retorted, putting her hands on her hips. ‘Why was this dweeb talking about drinks when I’ve turned myself into a sex goddess ... and why do I care what this little shit thinks?!’ Summer thought but did not say.

“Coffee!?” Morty spluttered. “Coffee! But you don’t even like coffee! And you weren’t even meant to be here today! You said you were on a date!”

Morty held both hands to his head and was practically hyperventilating. His gaze had turned back to his sister and despite his apparent horror he couldn’t help but drop his focus to his sister’s incredible breasts as his mind whirled.

“I needed something to perk me up and help me focus. Jake cancelled the date, okay? And I can come here whenever I want - it’s both our parent’s house!” Despite her defensive tone Summer was getting unnerved by her brothers obvious dismay.

“You’re not the only one who had the bright idea to revisit some of Rick’s old inventions. I found a revised recipe for the love potion I tried years ago. Remember the one? Nearly destroyed your world and did actually ruin mine? Well I made it so it was safe and a little less overpowering and ... I was gonna use it today. Jessica’s coming over any second for some joint revision and she’s been using coffee to help her focus,” Morty sighed and rubbed both his eyes wearily. “ Coffee, which I filled with the new and improved love potion...”

It was now Summer’s turn for her mouth to drop open in shock.

“You lectured me on messing with dangerous inventions!? While you’re doing exactly the same fucking thing! And coffee, Morty, really? You just left it lying in the kitchen!”

Despite how angry she was becoming she was acutely aware of a wetness forming between her legs. She crossed her arms hotly and was amazed at the weight of the tits spilling over them.

“I only left it for a minute and no one else was meant to be in the house!” Morty continued to address his sister’s mammoth mammeries and found it even harder to pull his gaze away.

Despite the raging mix of emotions coursing through him, his cock had ignored what was appropriate and had began rising to attention. Morty thought a silent prayer for his brilliantly enhanced boxers which, much like the Doctor’s Tardis, had been altered to be larger on the inside. This meant no matter how hard he became he was completely concealed. This rather genius invention had saved him from countless embarrassing occasions.

“It was still completely careless!” Summer raged, refusing to back down. She noticed that despite her brothers fixed stare at her magnificent new assets he clearly wasn’t even getting the smallest of boners and for some reason this seriously bothered her. She felt the almost uncontrollable urge to demand why Morty was not physically responding to her irresistible body. She kept telling herself this was just her pride speaking and she pushed on in the conversation in an effort to distract her dirty thoughts.

“I, eh, thought you said the love potion affected everyone except direct relatives, anyway? Maybe you’ll just have to make a new batch and try again at your sad attempt at seducing Jessica.”

Morty sighed and rubbed his eyes once more.

“Yeah, but that was the old formula, Summer. God knows if that rule still applies!”

“Well I think we’re freaking out over nothing,” Summer huffed, moving her hands to her hips and trying not to rub her thighs together. ‘Why am I so horny all of a sudden?’ Summer wondered.

“Fine let’s forget the potion - which was a nightmare to make by the way! What are you planning on doing with those things,” he gestured to the gigantic breasts unnecessarily. “Mom’s gonna go crazy when she sees them. She had to help you last time remember?”

Summer bit her lip anxiously for a moment before answering. She had rushed into using the Morphizer but she had had one idea and now that she had this love potion leverage on him, maybe she could make Morty help her.