The giantess woman

Sophie: "Where's the giantess woman at?"

Alan Coitus: "Near the highway, up North from there. Apparently she's in the process of crushing cars. Be careful with her, you hear?"

Sophie: "Yea, yea. In case you haven't realised it doc, I'm a fucking ace at this. You got nothing to worry about."

You speedily head towards the highway. The giantess isn't easy to miss - just the thumps and crushes of her playtime can be heard miles away.

Sophie: "So what's the deal with Spontaneous Gigantism or whatever it was?"

Alan Coitus: "To be precise it's Giganticism... but anyways: I've not developed the condition beyond the premise of 'a person suddenly growing to unnatural **** sizes and somehow being able to maintain life functions despite it.' There's not much else to it, I'm afraid."

Sophie: "Is there, like, a reason why they shouldn't be able to live?"

Alan Coitus: "The square-cube law maintains that when size is scaled, surface area is squared while mass is cubed. In practise, this gives a theoretical upper limit to the size of a living being, when at a certain size their muscles are not strong enough to support their immense mass. Respitory systems and blood circulation would fail. This is why the blue whale, the largest known animal ever, lives in the water, as waterborne movement requires less effort..."

Sophie: "Alright alright. I remember reading about that sometime, yea... "

You're pretty sure you actually haven't, but say so anyways to make him shut the hell up.

You're now on the freeway, with the giantess lady in plain sight. No need for a plan of action, you feel. Just do what you do best: be hot and kick ass. As they're about to squash another long-since abandoned vehicle, you intercept her.

Sophie: "Halt! The property damages you're causing are way off the charts, and you need to stop right now."

The giantess does stop, but she doesn't look at all pleased about this development.

Giantess: "I don't wanna!"

Sophie: "Well you gotta."

Giantess: "Make me!"

Sophie: "Well then I guess I'm gonna have to make you!"

Giantess: "Fat chance!"

The giantess woman stomps her foot in an attempt to hit you. You dodge her sluggish movements with ease. Mockingly, you lean forwards and show your tongue at her.

Sophie: "Lol, I could read the day's newspaper cover to cover while you swing your fatty thighs around."

Giantess: "Grrr!"

She tries striking again. This time you casually stand still, inattentively examining your claws, just waiting for her to stomp you, until annoyingly zooming off right before she's about to make contact.

Sophie: "Have you even killed anybody yet? I bet you almost got somebody once, until continental drift dragged them outta reach."

Giantess: "T-that's none of your business! I've killed plenty of people! (I think...)"

She's taller than the Statue of Liberty, and yet you can't really feel threatened by her. Even if she did manage to step on you, your superhuman body would simply harmlessly indent itself into the concrete. It's not yet fully clear what exactly your plan is, but you suppose there's no harm in further aggravating this violent, horribly destructive giantess.

Sophie: "You know what'd probably be the **** of me? If you grew so tall that I wouldn't have time to run away from underneath the width of your foot."

Giantess: "Hahahaa! Oh you fool, you've revealed to me the instrument of your doom! Fffuck, do I love growing..."

The giantess begins to jill off right there in front of you. As a result, her looming shadow slowly starts to widen. Her proportions seem to change as well - she seems to pile on enough curves for the entire Alpine road network. If mass is cubed when scaled, sexy must be to the fifth power. She has reached such heights that it's impossible for you to guess just how tall she really is. There's nothing in the world that stands so tall at such a rapid incline.

At these sizes, her booming voice is more akin to thunder than any recognizeable sounds. Still, you stand firmly and defiantly in place, mocking her impressive and formidable stature.

Then, she starts to lift a single leg in an apparent attempt to squash you once and for all. You patiently wait while she slowly, slowly positions her foot square center to you. At about halfway through this endeavor, though, you realize that she's overshooting by quite a bit. In fact, it seems almost like she's stepping completely over you. As the sole of her foot passes you by and you look up, you realize that the giantess woman is indeed falling.

Her legs are so long that the rest of her body lands completely outside of the city limits. A gargantuan footprint on your immediate surroundings and a chasm a few miles down the road left by her thigh are the only urban collateral damage.

Sophie: "That went pretty well."

You're about to run all the way to her face to see what the deal was with her, but suddenly the giantess begins to shrink. Quickly at first, but slowing down as she approaches normal proportions. In a minute, she's back to normal, and apparently asleep.

With your inexplicable detective skills, you quickly piece together just what happened: Apparently, a feature of Spontaneous Giganticism is greatly enhanced muscle, blood circulation and respitory systems to allow functioning at greatly increased sizes. However, these enhancements do not scale as quickly as mass. Therefore, at a certain size, the giantess's heart could no longer pump enough blood into her brains, and she fainted after raising her leg to stomp on you.

You also correctly suppose that her growth is an active power, meaning that once she lost consciousness, she began to shrink.

Sophie: "Hey, wake up!"

You nudge her a little bit. She comes to, moaning, and holding her aching head.

(Not) Giantess: "Wh-w----... what the fc-fcuk...?"

Sophie: "Toldcha I was gonna stop you. I was going easy on you there, but just so you know: if I catch you trying to break shit or kill anybody, I'll slice your tendons."

With an audible swish, you reveal your superhuman claws, which strike fear even into the dizzy, confused woman. With wide open eyes focused on your razor-sharp superhard nails, she nods along silently.

You've succeeded.