A Big Girl at the Gym

Working title: Onegai Muscle

Requested by my patron Oloshadow.
The image I used is of Pandora "Panda" Smith from Muchigaku, drawn by MW-Magister. They tend to not draw much muscle-oriented art, so anytime they do, they post the end result on a relevant 4chan thread. This particular one came from a hyper muscle thread on /d/, courtesy of Desuarchive.

Thanks to Akane for beta reading and additional contributions.

All persons depicted are fictitious, not owned by me, and above the age of 18.

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TRANSCRIPT:
*pop* Hm? Oh, you're talking to me? Ah, you noticed how huge I am. There's actually a bit of a story to that.
First off, my name's Michelle. I actually used to be something of a beanpole, believe it or not! I felt like I was past due to work on that, so I decided to start working out just yesterday. I basically spent the whole day at the gym, working hard and having a good time. I went to sleep that night feeling great--accomplished, satisfied.
I woke up this morning looking like this... somehow. I came back here to see if I had done something irregular. Then it hit me: how do my clothes still fit if I'm so huge now? It didn't take long for me to figure out the answer: because I like this sports bra and panties. I wanted to keep wearing them, so I subconsciously ensured they'd still fit.
In other words, I'm a goddess. My power is, as far as I can tell, absolute. I haven't actually found any upper limits to what I'm capable of--wouldn't surprise me if none exist, really! I can produce a magnitude 10 earthquake with the same amount of effort it'd take to hold a feather. To clarify, a magnitude 10 normally can't happen because there aren't any faults large enough. Of course, I have ways around that now.... That's not to say I don't have control over my strength, though. I can regulate precisely how much force I exert at all times. Nothing gets destroyed unless I want it destroyed.
You look surprised. I can't say I blame you--I was too, at first. Muscle--even human muscle--is capable of a lot more than you think. I can fly or even travel through time and space just by flexing!
You are right that a body this huge is an inconvenience, but I can look however I want. As it turns out, this is my ideal body. I apparently had some body dysmorphia about my scrawny body deep down. I didn't realize it was even there until one day I suddenly had my perfect body!
I'm exploring all of time and space now--even realms beyond those concepts. My mind is spread across... well, everything now. I'm on the other side of the planet, the other end of the galaxy, yesterday, tomorrow, a million years ago, a billion years from now, even in completely different universes! I daydreamed about this sort of stuff as a kid--though back then I was thinking more in terms of comic book superheroes than actual uninhibited god power!
Ah, sorry. I can tell this is all pretty overwhelming for you. You don't really need to know all that. Suffice it to say I'm just a big girl at the gym. Would you like me to spot you? If you have time later, maybe we could go on a date too?