Jennifer was right. All his self-delusion about "teaching her a lesson" had been little more than malevolent jealousy. He'd had a crush on Jennifer for years. She probably didn't remember it, but they'd even played together a few times in elementary school.
He looked around at the demonesses. In spite of the fact that their magical charms had no affect on him, his own perverted psyche found something alluring about their sinful forms. Lust was the end-all of their existence.
"Okay," he muttered. "I accept your offer."
Jennifer grinned evilly, "Mmmm. This will be nice. Okay, Kyle, transform or dare?"
"Transform..."
"Kyle, you shall become a powerful demon of lust and share dominion with me over this world. Your cock will grow enormous and thick and it will be prehensile. You'll be able to telescope it from 10 inches out to a long tentacle at your will. You will also have a stomach cavity containing even more tentacles. You will be irresistible to mortal women and, like me, your power will grow with every body and soul you corrupt." Jennifer licked her lips in anticipation.
Kyle felt the shield he'd created to protect himself straining and willed it away entirely.
He felt a tingling in his loins and his pants began to swell. Jennifer walked seductively towards him, shedding her human guise. She dug her claws into his pants and tore them away, along with his boxers, revealing Kyle's erect 5... 6... 7.... inch cock. Jennifer ran a hand over it, exciting him further.
"Mmmmm... I want to feel all of this," she purred and took in all--currently 8--inches of Kyle into her moist, purple twat.
Kyle felt his excitement soar. Finally, after all these years, he was finally fucking Jennifer.
Jennifer bobbed up and down on his cock, moaning like an unholy whore. She deployed several tentacles and began caressing Kyle's face with them.
Kyle felt a surge of strength as his muscles exploded to the size of a career bodybuilder. He used his newfound strength to grab Jennifer by the ass and lift her off her feet. He carried her over to, and pinned her against, the cafeteria wall.
Out of his peripheral vision, he could see the other demonesses rutting with each other. Susan, Mrs. Moore and Christina were a multicolored orgy of tentacles while Yuriko and his sister licked each other wildly with their mouths and groins.
Long ebon claws shot from his fingertips and he dug them into Jennifer's rear, drawing further moans of pleasure from the demoness. "Yes, fuck me harder, Kyle!"
Kyle's own breathing became bassier and stereophonic as he felt his tongue lengthen and become forked. He ran it over the fangs growing in his mouth. His skin turned red and became leathery. A spiked tail grew from the base of his spine.
As demonic wings exploded from his back and dark talons from his toes, Kyle felt his perverse kinks turn into full blown fetishes. The thought of fucking innocent women, taking their souls and turning them into lustful creatures of darkness excited him further. He was a demon now.
With a thought, Kyle opened his stomach cavity and plunged a tentacle into Jennifer's ass and another into her mouth. The demoness's reptilian eyes went wide with pleasure as she stimulated all of his phalluses.
Both creatures climaxed as Kyle's facial features became more angular, his ears pointed. Two large, black horns erupted from his forehead. Kyle shot his enormous, black load into Jennifer and she orgasmed wildly, coating him with purple vaginal fluids. The two creatures shuddered in pleasure, coated with each other's love mess.