Personally making Shantae as big as possible.

"Get down on your hands and knees, slut, and stick that booty in the air!" commanded Rotty. Shantae hesitated for but a moment, then obediently lowered herself onto all fours, sticking her butt up and looking back at the zombie. Rotty began digging around the room for something. "Aha! This will do perfectly!"

Rotty had found a fly swatter. Shantae gulped. Positioning herself right behind the dancer, Rotty spread her legs for stable footing and raised the swatter. "Alright, I hope you're ready for a sore tushy, because I don't use safe words!"

The instrument came flying down at incredible speed, right towards Shantae's waiting buttocks. SMACK! "Ahhhh!" It stung much more than Rotty's hand, which only aroused Shantae more. SLAP! "OOOOHH!" FWAP! "MMMMM!" CRACK! "YES!" Over and over Rotty brought the swatter down onto Shantae's tush. With each strike, her butt filled out a bit more, each cheek inflating like a round balloon. And the guardian found herself really getting into it. After the third swat, fluid dripped down her legs as she came.

Rotty was also enjoying herself immensely. Shantae was being her willing plaything, something she thought she could only ever dream of. She was entranced by seeing that booty swell in front of her. She needed more of it.

Bigger and bigger Shantae's ass swelled as Rotty continued to hit it with rapid gusto. Her cheeks surpassed twice the size of her own head, two tanned, spherical orbs protruding from her hips. They wobbled and jiggled like gelatin, the reverberations from Rotty's **** clearly visible, rippling through her flesh.

"OOHHH! AAAHH! MMMMM! MORE! YES! MOOORRREEE! SMACK ME SILLY!" Shantae was losing her mind. She climaxed over and over again, drool leaking from her lips as all her brain power got wrapped up in the sensations of her butt. The bigger it grew, the better each spank felt.

Encouraged by Shantae's response, Rotty accelerated her swinging. Despite the constant exertion, Rotty never tired. Exhaustion was something for the living, not the undead. Shantae's golden brown orbs picked up the pace of their growth, swelling bigger, and bigger, and bigger. As they began to outsize the rest of the half-genie, Rotty had to step back to ensure she had swinging room.

Shantae's legs trembled under the increasing weight of her massive bubble butt, until they finally gave out. Shantae lay completely flat on her stomach, twitching as her eyes rolled back, still moaning with each sting on her behind as her body gradually disappeared underneath her ass cheeks.

Rotty was too lost in the moment to really realize just how far she was going, even when the growing booty in front of her started to loom over her in height. She just kept smacking it, wanting to see it grow ever bigger, slowly backing up as its mass crept toward her. Shantae could only be heard as muffled moans, her ass completely covering her as it gradually filled the lower level of the lighthouse.

It was only once she backed into the front door that Rotty snapped out of it. Seeing the massive brown wall still inching toward her, she realized she needed to get out right now, and quickly opened the door. As she hurried outside, Shantae's massive ass took up the rest of the empty space in the room, bulging out the doorway and windows. Fortunately, it seemed to be done swelling, though Shantae could still be heard quietly moaning within.

"Maaaaybe I should find somewhere else to be," thought Rotty, feeling a bit guilty for turning her friend into a bit, bloated, quivering ass of a woman. She looked at the wand, awed by the power it wielded. There was still fun to be had.