Oh, come now, surely that's not enough for you, is it?
Don't you want to see just how large you can manifest yourself here?
I know you do. So why not indulge yourself? Make yourself happy?
Make yourself feel so very good.
Don't hold anything back.
She's apprehensive at first. Sure, she may have made a few idle remarks, but overall she'd prefer not to cause complete chaos, actually, especially in a timeline she was planning on getting comfortable in.
Something about that suggestion sticks in her mind. The tone of voice, perhaps. Or her already aroused state. Or the fact that every single word of it rings completely, utterly true.
Rose plants her feet on the ground, focusing on the boundary between this world and her own. A careful unseen tear giving way to a bubbling wellspring of her native darkness under her feet, like sticky purple-black tar. Tendrils snaking forth from her body, submerging themselves into the pool.
Connected. Pulsing, surging. Drinking deep of that bounty of pure corruption. Shadowy tethers pumping more mass straight into her body.
Taller, thicker, wider - anywhere there's room for more is quickly filled. Head tilting back in unthinking bliss as she effortlessly shatters the roof of her abode and doesn't even slow down. The rift below her widening along with her, more tendrils plunging down into it, the only thought on her mind to keep feeding her growth. To drink more. To be MORE.
The building was surely only dust beneath her feet now.
Darkness curling and writhing around her, the boundary between her human form and the raw abyss blurred, pitch black tentacles squirming and shuddering in time with her body.
Towering up toward the sky, the shadow of her rear alone enough to eclipse an entire city block. Every bit of her jiggling obscenely as it pumps bigger, spills wider. That won't be enough. Nothing will ever be enough. No matter how long it takes, no matter what happens. She needs. To be.