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Alice and Sam cleaned themselves up and headed home. There they sat down on Alice's bed and Alice decided to spill the beans.

"Sam, I gotta tell you something." Alice started. Sam looked up.

"Yesterday we didn't look like this, at all. I found this book," Alice summoned the book to show Sam, "and have been making changes with its strange magic powers. This is why I'm a futa and why we got so much sex and stuff." Alice looked at her twin waiting for her reaction.

It took her a while, but once she processed it all the look of confusion on her face was replaced by a mischievous grin.

"So you can change the fabric of reality?" Sam asked.

"Yes, I can." Alice replied.

"So... can I make requests?" Sam asked cautiously.

"I guess so." Alice answered.

Sam's grin widened. She leant over and whispered her idea into her twins ear.

-New Rule: When ingested cum causes random sexual mutations. The size of the load determines the mutations and futa cum causes larger mutations. Mutations can be permanent or temporary and last various amounts of time.

"So, what do you think?" Sam asked.

"I love it!" Alice exclaimed as she closed the book.

"You wanna test it out?" Sam inquired.

"Sure!" replied Alice and quickly stripped off her outfit. Sam did the same and kneeled down in front of her twins throbbing cock. She grabbed it and felt it grow and stiffen as she started jerking it off. Soon it was slick in natural lube so Sam leaned in and rapped her lips around the cocks head. She started bobbing up and down on. Alice moaned in increasing amounts of pleasure and started to play with her massive tits. She squeezed and streams of milk erupted from her nipples. Drops fell down and landed on Sam still bobbing up and down. Alice felt close to orgasm and grabbed Sam's head, forcing as much of her cock into Sam's mouth. Sam gagged and then moaned as Alice's cock started throbbing shooting wave after wave of sweet cum into Sam's awaiting mouth. Sam eagerly swallowed every drop and rose to plant a big kiss on Alice's mouth. Alice could taste her cum on Sam's lips and leaned back with her eyes closed.

Moments later they stood up and waited to see what mutation Sam would get. Sam moaned as a sudden wave of pleasure spread across her body. And then beneath her massive tits another pair of slightly smaller swelled and developed. Sam moaned again admiring her new four breasted form.

"Damn, Sam, that really was a good request, the new pair really suit you!" Alice exclaimed.

"I know, right!" Sam replied fondling her new boobies.