"Come on, what are you waiting for? It's still pretty sweaty!" Vanessa joked, wiggling her buttocks a little.
Taking advantage in the lull of lickings, you applied the change. The magic took hold instantly, though you couldn't tell by looking. As far as Jason knew, it was just her regular, sweat-drenched ass. Swallowing his pride, he slid his tongue against her glossy skin, expecting that awful salty taste to return. His was in for a shock, then, as he felt his appendage sink into her! His tongue merged with her left cheek, disappearing bit-by-bit as he pressed against it.
To Jason, it felt like sticking it in a warm bowl of water. Seeing the pink lump vanish into his sister's ass was shocking but he only began to truly panic once he realized he couldn't take it back out! He tugged back, to no avail. In fact, even the full force of his body didn't even seem to make Vanessa budge in the slightest. She was oblivious to it all, save for the fact her brother wasn't tonguing her.
"Excuse me, did I say you could stop? Keep going!" she demanded, shoving her rump back. It collided with Jason's head, immediately absorbing most of his head. Only the base of his neck remained outside, preventing him from letting his sister know of the horror. Instinctively he crawled back which his sister took for even more insubordination. In response she bounced back even harder, slamming her (now fatter) ass into his upper body. Shoulders, chest, and upper arms were rapidly absorbed.
His shrinking form caused her body to shift. Vanessa took it as squirming.
"Oh ho ho," she laughed, "Very fiesty today. Someone's getting their balls stepped on after dinner!"
Though something was off about today. Not just her brother's resistence; torturing him had made her a lot more turned on than usual. Beads of moisture formed in her panties as she unconsciously began to bite her knuckles.
She was completely unaware of the fact that half of her brother had been converted into ass. As she worked her way down his torso, you were faced with yet another choice. To what extent should she absorb her targets? Purely turn them into fat? Or have her take on their body parts, gradually turning her into some kind of eldritch abomination?
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