I did not really see any age for the Body's so:
Divid body is 16
Mariah body is 15
Jakes body has just turned 16
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Daved, had enough after spending one night in his sisters bed feeling all the fat on his now her body, and decided that morning if she is now stuck as Mariah she was not going to stay fat, so she went down into the kitchen, once getting on her baggy clothes what did not help hid her fatty body and when her mom put Mariah's humongous fatty breakfast on the table, she said "no mom, if you want me to be stuck in this fat disgusting body than i am going to have to make it my own, and that means i am going on a diet and going to start going to the gym!" The New Daved/ old Mariah was there eating what old Daved would eat and burst out laughing say “whatever you say you little pig, don’t you think I never tried that, just face it you are now a fat, little loser what no one likes, and you will never have anyone like you!” mom did shout at him but, he just smiled and walked off, but the new Mariah new she needs to lose this wait on her new body, and she is going to give it her all! even if her sister in her old male body is a dick!
Surprisingly mom was ok with making her different meals and even payd for her gym membership, what she did for Daved in the past? she started to make new Mariah very healthy meals and, and new Daved was not wrong it was really hard to stick to them, she collapsed about 5 times at school, with her big fatty body not being used to having so little food in it, and it did not help that she forced herself to spend nearly every evening at the local gym, pushing herself an till she could not breathe.
Sure, there where the normal people who bulled Mariah before the swap, and now bulled the new Mariah/old Daved, but she did not let that stop her she was going to fix this! and kept on pushing her self
"7 months later" and a lot of hard work, and a lot of new discovery's new Mariah found out about her new self, like how she is now a straight girl, and how she likes likes her old best friend who likes likes her to, now she has put in the work!
she was in her room with Jack her old best friend when she was David, he was the only one who she told she was going to be Mariah before the swap, and he was sitting on the bed making out with Mariah touching up her tight ass through the short skirt she was wearing, and perfect hourglass figgier what had nothing covering it, showing off the slim 6 pack and cute belle button wearing a top showing off her fin/fit body, and said between their lips connecting "god, babe I told you, you can make your body great, and look at you, perfect, no fat anywhere except here, and here" with one of his hand grabbing her nice tight ass, and big tits.
Mariah could not help but laugh, "sure hot stuff, I am pretty sure that you would of gave up on me if i was still as fat as old Mariah" and she knewing it was true, she could tell straight away that he was coming over after school 7 months ago, only because he felt bad and because all of her old friends did not know about the swap and carried on shouting insults at her, knowing that is mostly her own fault, because back when she was David she starting the bulling on her sister, and then when the swap happend the new David made her old friends do and say worse things then what she already made them do, what just made her feel bad and sad, and she could see Jake did not want them to target him as well, so he kept his friendship with her a secret from everyone, and only come over when new David was not there.
but when she started to loss wait and gain muscle, tight muscle, it all stopped straight away, and a lot of her old friend who still hang around the "new David" would now flirt with her, what she found her self flirting back for fun. seeing it made "new David" mad and shout, and even people who would not talk to her when she was David started to talk to her, from the cheerleader asking if she wanted to "hang out” what she did and became fast friends with them all, to the football caption who asked her out two weeks ago, what she said no, knowing Jake is the only boy for her.
And why Jake? well because Jack was always there for her and, sure he only was there to begin with because he felt bad for her, and she could tell when he started to actually want to be around her, by him actually smiling when he came round to hers after school and he would actually look, talk, and hangout with her, not mind being seen with her at school, and yes it was only around 2 month ago he started to do those thing at school, and yes when most of her fat was gone, so why Jack, because he was and is always there for her, even when he did not want to be, and he was the only person to talk to her, when she had no one at all, and he is still with her but more now, even now when she have more friends than him! with becoming friends with the hot and poplar girls and cheerleaders, who where actually fun when they let you in to their cecal, and there party's are wild!
She is also with him, because he was her best friend before she was Mariah, and now he is more than her best friend now she is Mariah, well the new Mariah, the person she is now.
But of course, he said after what she just said to him “what no, I would of never dropped you if you where still fat, because you are mine, and I knew and now know, you can do anything, just look at you, the hottest and best thing in my life, and I now you know I love you more than anything in this would or any other one out there, and you will always be mine whatever you look like” and then he kissed her again.
She just smiled and thought Becky (her best friend who is a girl and that's all) is right she is amazingly lucky, to have a boy who loves her, and loves what she loves and pushed Jack off her and said “well I want to play this new game with you before you have to go home” with her picking up her pink controller and Jack smiling saying “you know how lucky I am, you are the dream girlfriend, the hottist girl at school, and loves videogames, and amazingly smart” she just smiled and said “I know” kissing him with the game loading.
while they where kissung, new David opened the door just in time to see his old now perfect body, and looked pissed seeing new Mariah looking so happy, and shouted “mom Mariah's and her pervert boyfriend are making out behind closed doors!”
Mariah and Jack looked at new David and sighed “he has been making their life's hard to say at less when he found out Jake asked new Mariah out and she said yes,
Jake said “jezz dude, you know Mariah and me are not even a year difference in age!, and why are you such an asshole all the time, and you wonder why you nearly go no friends now, and weren't you the one who wanted that body you got?” new David was about to probably say something stupid back, but mom barged in and look at the three of them, and then said “David for the last time leave Mariah alone! you are not getting her body, and it is your own fault if you are miserable with your body! Mariah made her body her own and so can you if you want? Now out and leave your sister and Jake alone!” new Devid did not movie and shouted “but mom she stole my body, I deserve it back! it was mine to begin with and I have a right to have it back!” mom just sighed and grabbed new David's ear and pulled him out of the room saying “sorry about him you two”
And that really was it for the night, the rest of the evening was just the same with what they normally do, except Mariah told Jake about yesterday when new David told there dad and mom that he wants his body back and how she just said go to the gym if you want to be stronger, and called him a twink, what dad laughed at, what also made Jake burst out laughing, but after that they carried on playing her new game while making out and touching each others bodys now and then, and Mariah gave Jake a goodbye blow job before he had to head home, swolowing it all for the ferst time, feeling pleased by doing so, but she could not do anything more... vhusical with it being a school night, and wnating to give him something to remember her for the night, she went to bed that night, thinking off the fun she is going to have in school tomorrow, maybe she will get the football time to beat up New David again? closing her eye smiling at that.