Ascend into a Giantess

You decisively straighten out your bare body, lowering your one leg to reveal your vag and taking your hands off from your boobs.

Sophie: "No more shame for me! I'm a giantess, and everyone else is gonna have to start acting like it."

You get away from the city center and find a relatively open field of grass to sit down in, and continue masturbating without a care in the world. Trying to keep yourself out of the nearby roads soon becomes pointless as your legs become bigger than semi trucks after a few orgasms, which leaves it up to the drivers to avoid crashing into you. After about a dozen more orgasms, you can feel buildings against your skin that were near the horizon last you checked.

Standing up makes you feel vertigo. You can keenly sense that you're moving at astounding speeds just to reorient your body parts, and as you stand up straight, you find your vision blocked by clouds.

You take a few stumbling steps, inadvertently crushing a whole block, and sending tremors all over the city. You could probably span the entire city in a single step, that is, if you could actually see where the damn thing was. You have to crouch down to get your face below the clouds. The tiny people there must think God has gone through HRT. You take the opportunity to roleplay a little.

Sophie: "Your God is angry! You're being too cruel towards minorities! Mend your ways or face destruction!"

You have no doubt that most people who heed this message will twist it in their weak little minds to justify even more cruelty towards minorities, but what can you do? You're a giantess, and honestly shouldn't concern yourself with the matters of tinies.

You slowly walk in the opposite direction of the city. You're tempted to keep masturbating and growing, and eventually become big enough to jump off the Earth entirely, but first you decide to hold your breath for a while to see if you still need to breathe. You may be horny enough to not be bothered too much by property damage or being homeless, but the idea of suffocating in the vacuum of space is still terrifying.

You hold your breath for a few minutes, not feeling even the slightest discomfort. Just to be sure, you keep at it, longer and longer.

After what must be half an hour, you decide that you've tested yourself sufficiently. You spread your legs wide, one foot crushing an industrial zone on the West side of the city and another crushing a neighborhood on the East side, and go ham flicking your clit. After a few more orgasms, when the mass of your legs is threatening to puncture the tectonic plate, you spot something very small moving around in the city limits.

It's Stacy. She must be two hundred feet tall, because she towers over the buildings of the business district, but to you, she's the size of an insect. You briefly wonder how this could be, but accept the situation. You doubt Stacy is here to sic more work onto you.

She lumbers towards you and grabs hold of one of your toes. She also seems to be yelling something, but you can't hear her words at all.

You pause your masturbating and lean towards Stacy, who is clearly doing her best to get your attention. Moving very carefully to avoid hurting her, you crouch down and speak quietly to her, leaning your ear as close as possible.

Sophie: "Stacy, is that you? Are you growing too? Do you want me to slow down so you can catch up to me?"

Stacy tries to yell, but it just sounds like soft murmurs to you. You watch for a while as she grinds her vag against your toes, bringing herself to an orgasm. At the onset, she too grows, to over twice her previous size. She must have a slightly higher growth rate, but considering that she's not Sophie motherfucking Choice, she lacks the endurance to be cumming her brains out on repeat.

Now you can just barely hear her.

Stacy: "(You glorious sex beast! I'll catch up to your size if it means getting a heart attack!)"

You don't have the heart to tell Stacy that if she's a giantess too, then she probably can't get a heart attack anymore. You also notice that her form has become much more lush: she's gone from stick to thick. Like a great big ball of sexy.