Jennifer rode Kyle's giant cock with glee, moaning with pleasure as she neared an orgasm. Then she suddenly felt someone grab her from behind and toss her onto the couch next to Kyle.
Kyle was sure he would have to bribe Jennifer into fucking him, but that wasn't even necessary. Suddenly Jennifer was thrown aside, and before Kyle could react someone else had his cock in her mouth. And wow was she good. Jennifer was both eager and experienced giving blowjobs, but this new babe had the skills and tongue to put her to shame. He should have blown his load almost immediately, but somehow he didn't. Then he noticed she had horns and a tail.
Liz stood back up, and licked her lips while looking at Kyle. As worked up as Kyle was, he should have cum the moment he looked at Liz with her perfect succubus body. But instead he was suffering the worst blue balls imaginable. His body desperately wanted to release, but somehow he couldn't. He couldn't even move.
"What did you do to me?" he asked.
"Keeping dinner ready" Liz said with a smirk.
Jennifer had her bearings and was staring in awe at the succubus. She wasn't sure if she wanted to start hitting the demon out of anger for interrupting her orgasm, or start making out with her because of how sexy she was. Then the succubus looked directly at Jennifer and she suddenly recognized the interloper.
"Liz? Is that you?" asked Jennifer, barely believing it was possible.
"Oh yes" said Liz. "In the demonic flesh."
"You found the book!" said Jennifer.
"Book?" asked Kyle. Then he remembered. "Oh shit - that book!"
"Stupid boy. Even if you didn't read it you would have had fun looking at the pictures. I know I did."
"Make me a succubus like you!" begged Jennifer.
"With pleasure" replied Liz.
The succubus climbed onto the couch, straddling her girlfriend. They began to make out as Liz slowly undressed Jennifer. Kyle could only watch and whimper. Once Jennifer was naked, Liz dropped to her knees and began to orally pleasure Jennifer with her sinuous tongue. Soon Jennifer was orgasming on the coach. For Kyle, it would normally have been a sight to make him giddy, but frozen it place meant that being waterboarded would have been less torture.
Finally, Liz stood up, and helped Jennifer back onto Kyle. Magically pinned to the couch he had been rendered little more than a giant dildo. Liz stood behind Jennifer, the succubus fondling the human's breasts and kissing her neck. Kyle felt himself freed from the spell holding him in place. Part of his brain told him to push the two girls away and flee, but he had been ruled by the desires of his dick and this time was no different. Especially because release was finally near. Kyle began thrusting into Jennifer, who was recovering from the dreamy daze brought about by Liz. Soon she was back to riding Kyle. Jennifer could feel her body growing unnaturally warm.
"You're almost there" said Liz "Just a little more." Not that Jennifer need the encouragement. Liz could feel something sliding between her legs and knew it was Jennifer's demon tail growing. Liz eagerly let the trail rub against her clit as it grew.
Kyle finally erupted, letting out a scream in the process that was a mix of pain, pleasure, and sheer relief. Jennifer was orgasming too as she transformed into a succubus. Feeding off the sexual energy, Liz began to orgasm as well. The women screamed in pure, primal pleasure. Kyle thought he was finished, but somehow kept pumping into Jennifer. He began to feel weak and recalled that a succubus drains men of energy. Yet he didn't want to stop, so great was the pleasure he felt as well. Just looking at Jennifer achieving such a perfect demonic form kept him going. On it went for what seemed like an eternity until Kyle finally blacked out.
Jennifer stood up and inspected her transformed body. She turned around so Liz could see her. The two succubi kissed and caressed.
"We did it" said Jennifer. "This is fucking amazing."
"And we'll have lots of amazing fucking too."
Jennifer looked at Kyle laying limp on the couch. "Did I fuck him to death?"
"No, but I think he'll be asleep for quite awhile."