Kat walked over to her bed and sat down; picking up the spell book on the way. "Now, where is that spell?" She flipped through the pages, idly bouncing on her ass as she did so, causing her breasts to jiggle helplessly. Then, she paused for a second. Moving the book and standing up, she reached behind herself and looked back, cupping her ass cheeks, only to find there wasn't much there. Looking down at her breasts, she also realized she concentrated more on putting their souls in her breasts than their mass. Kat thought for a second, then smiled a wicked smile that is only reserved for the worst people.
Accessing Dan and Kat's memories, she found two people who would be perfect for the job, Chris, Dan's friend, and Maxine, Ashley's friend.
Chris was tall and lanky, but was honestly pretty sweet. Maxine (often called Max) was a bit shorter than Dan. She was flat as a board but made up for it with her wide hips and very meaty ass.
"Are you ready for some roommates?" She said, preforming a silencing spell. Dan jiggled furiously while Ashley whimpered quietly into Dan.
With a wave of her wand, she summoned both of them, and with a small enchantment, she filled their minds with lust. Stroking her chin, she came to the conclusion that Max should be her pussy, since it'd be familiar for her, and that Chris should be her new ass. Max would have to add most of the mass, but she had a lot to spare.
"Hello, my servants," she said, undoing her bra. Dan and Ashley looked on at their friends, their eyes distorted with a pink glow. "Now, strip."
Chris and Max practically tore off their clothes. When they were done, she noticed how big Chris was; it might've been eight inches long.
"You," she pointed at Max, and then pointed at her own vagina, "eat me out, and you," she pointed at Chris, and then pointed at Max's ass, "use that tool."
The three took their positions: Kat sat on the bed, legs spread just wide enough for Max to plant her head between them. Max put her hands on Kat's small ass and nuzzled into her new position. Chris stuck his tip between Max's globes so that it touched her tight hole; it had disappeared a good five-six inches between them before it hit something solid. Max moaned into Kat as it disappeared into her.
Kat put her hand on the back of Max's head. Max began licking at Kat's pussy, pushing deep into her.
Kat looked up at Chris and snapped her fingers. Chris pulled back a bit before plunging his length near entirely into Max. Max yelped, tightening around Chris, but he didn't slow his assault of her ass. Max attempted to continue, but was completely incapable.
Kat frowned, but quickly came up with another idea. Getting up, she turned around and bent over, puting Max's face between her cheeks. Casting a molecular reconfiguration spell; Max's lips fused with her anus. Her arms morphed into Kat's ass and thighs, adding a bit of mass to Dan and Ashley.
Chris' vigorous fucking pushed Max into Kat's ass, causing her face to merge with her cheeks. A muffled moan echoed from within Kat's crotch. Kat reached back and grabbed Max's ample ass.
A thought then went through her mind, I could become a centaur.