You and your nerdy girlfriend had been fans of Final Fantasy 7 since long before you'd even crossed paths. You'd both met on a forum discussing the deeper lore of the game. So of course it made sense that to spice things up in the bedroom you'd both agreed to cosplay as your favourite characters from the game.
Your Cloud costume was tight, you didn't dare move too much in case you ripped the stitching. Mariah had the opposite problem, Tifa's iconic white shirt had never looked baggier than it did on her. You both looked at each other disappointed.
"Maybe we shouldn't have ordered these online?" Mariah pouted.
"Well, if there were any decent costume shops in town we wouldn't have to." you pointed out.
It was going to be impossible to get in the mood with these clothes on. You both slumped down onto the sofa, dejected. Mariah picked up the box the clothes had come in and searched through the packing.
"There should be a return form in here somewhere..." she started, before interrupting herself, "Hang on!"
From the box she pulled a large glass ball. You both recognised it as materia - the source of magic in the game.
"Woah, which materia do you think it is?" Mariah asked while studying the orb in her hand.
You grabbed the box from her and rummaged some more to find the invoice. You finally found the piece of paper, headed with the company name 'DJ's cosplays', listing all the items your costumes came with.
"Says here that the green one is 'growth' materia."
"Growth materia? I don't remember that in the game." Mariah complained.
"Maybe it was in the remake?" you suggested.
A naughty smile crossed Mariah's face, she lifted the glass ball and pointed it towards your crotch.
"Heh, I cast growth!" she declared before a blinding green light flooded the room.
You felt yourself pushed off the sofa by some unseen force amongst the chaotic light show that followed. When the lights finally died down you looked up from the floor to see Mariah standing over you - there was something different about her.
"Are you alright?!" she asked in a panic.
"I'm ok - are you?"
"I'm not the one who got thrown to the floor."
"Yeah... but, you're different..."
Mariah looked down at herself and saw what you were seeing - she was filling her Tifa costume now. Her scrawny physique had been replaced by a voluptuous figure. You stood up to get a closer look to find you no longer looked down on her, she looked down on you.
"Oh my god!!" she cried, "I grew! Its real materia!"
Mariah jumped up and down in happiness, you felt the floor shake under her new weight.
"Careful darling" you cautioned her.
Mariah flexed her now toned arms in front of your face, "Woah, no wonder why you got knocked down - look how strong I am."
You were looking, but mainly at how her chest now filled the white shirt better than Tifa Lockheart ever had.
Excited by these developments you both leaned in for a kiss, Mariah having to bend down to you for once. Your embrace was interrupted by another glowing light.
"Oh what now?" you asked before looking to see the source.
The growth materia, now on the floor, was glowing - and it seemed bigger.
"Does that look different to you?" you asked Mariah as she bent over to pick it up - giving you a chance to study her now gloriously round behind.
"Yeah... do you think its levelled up?" she proposed while studying the glass ball up close.
"What, like Growth 2?" you joked, but Mariah didn't laugh - she just seemed eager.
"Only one way to find out." she said before holding out her hand.
"Wait, no..." was all you could get out.
"I cast growth 2!" she declared loudly and suddenly the light show started again, now even brighter than before.
You again felt some powerful force, no doubt part of Mariah's expanding body, push you - then there was darkness.
You felt like you'd been in the darkness for some time, but eventually you heard you girlfriend's voice echoing around you.
"Honey, are you alright?" her voice rumbled through your head.
"Yeah." you were able to feebly reply, "Not so loud please."
"Oh thank god!" you heard her state, no quieter than before.
You opened your eyes to see a bright blur all around you - and you could feel the breeze. Were you outside? Surely Mariah's growth hadn't been strong enough to throw you through a window?
"Ok honey, don't freak out..." she told you as you regained your senses.
As your vision came into focus you realised where you were - you were on top of some building looking across the town.
"How did I get up..." you began before turning and seeing the enormous face of your girlfriend right in front you.
She treated you to a smile which was wider than your living room.
"You're... so big..." was all you could manage.
"Yeah..." she sighed, "turns out there's a bit of a jump between growth 1 and 2."
You took a moment to take her all in. The growth hadn't just made her bigger, it had made her even more voluptuous. Her breasts now barely fit in the white t-shirt which you were disappointed to see had grown with her.
"Woah, you are really big..." you stated on seeing her curves.
"Yeah, you said." she pointed out.
"No, I mean in... every way."
"Oh yeah, isn't it great - and check this out." she said standing up to her full height, she then turned around bringing you face-to-ass with her now enormous rear.
"Want to get better ass-quanted?" she joked, knowing full well you'd get the nerdy reference she'd just made.
"Uh huh..." was all you could say staring at her glorious behind.
Mariah, pulled down her skirt - pulling off her socks and boots in the process, revealing a giant black pair of panties beneath stretched to their limits on her gigantic buttocks. She slapped her ass and sunk her fingers in deep.
As you studied her enormous ass a question crossed your mind, "Did the materia level up again?"
She held up the glass ball, now giant in her hand but no longer growing.
"I'm afraid not." she stated with palpable sadness, before something crossed her mind, "Though... maybe I just need to pour some more XP into it."
You laughed, "What are you going to do, stomp some dragons?"
"No, but..." she started before suddenly taking a step over some of the buildings below towards a nearby tower block.
"Maybe if I smash a few things..." she said to herself, sinking to her knees and raising her mighty arms above her head.
Given how strong she had been before her last growth spurt you knew the tower stood no chance now. You realised that if things continued to get out of hand then this had all the makings of being your final fantasy.
This is a prequel to: Giantess kneels on city.
Meta: I was going to make this an in-world FF7 story but couldn't get a realistic enough version of midgar to collage with. I always thought FF7 could make some interesting logic for a growth story given the levelling system for materia - level 1 of growth materia makes you a busty amazon and level 2 makes you a voluptuous giantess. Who knows what Growth 3 would do to someone...
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