Alyssa and Patricia are brought into the fold, of course

Alyssa lay in bed listening to Alex and Carla moaning and screaming and pounding the furniture, the sounds obvious through the walls of the apartment. Patricia nevertheless slept on beside her, as she possessed the gift of deep sleep.

The endless fucking with lots of demon role play was definitely disturbing, but she'd be lying to herself if she didn't acknowledge it was also arousing. Carla's enthusiastic cries penetrated to her very core and Alyssa marveled at the couple's stamina as they rutted like crazed beasts in the other bedroom. She hoped that once they finished wrestling with their personal demons and fell into an exhausted slumber they'd be ready to tackle the difficult days to come. But every time she thought Alex and Carla had had enough they'd start up a new rhythm she swore she felt in her soul.

Despite her turbulent thoughts, Alyssa drifted into sleep before the couple. She awoke in the early hours sticky with sweat and other things, her throat aching and parched. Alyssa trotted into the bathroom and gulped down a glass of cool water, her sense of stifling heat easing a little. Until she turned around.

In the doorway was Carla. What used to be Carla. A new Carla. One with crimson skin and plump lips and even plumper tits. A gloriously disheveled mane of pitch-black hair and a wicked sneer and ferocious-looking horns atop her skull. Powerful legs ending in vicious claws digging into the hallway carpet. And a very wet pussy.

"I don't know about you, but I couldn't sleep a wink," Carla said. "I was so... hot and bothered. All those sexy beasts out there, taking what they wanted when they wanted it. The women and men so easily brought to heel, so quick to realize the eternal gift at hand. The thought of what the devils or their prey would do next once they were done with each other, who'd get fucked where and how and for how long, how awful and sinful and hot and exciting it would be."

Alyssa's mind was a mess as Carla sauntered into the bathroom. She stopped just short of Alyssa, who flipped through bad idea after bad idea of how to get away from Carla and back to the bedroom. She took in the demon's yellow eyes and fangs peeping from behind her lips and gulped.

"And now you should be thinking," Carla said, taking hold of Alyssa's arm, "what I'm going to do with you." She rubbed a sharpened finger across Alyssa's lips and let it trail down the front of her pink nightie. Carla leaned in even closer, her hot, spicy breath clouding Alyssa's thoughts. "And what Alex is going to do with your dear wife," Carla whisper-purred.

"No no no," Alyssa moaned.

"Oh yes," Carla said, spinning her friend-turned-captive around and marching her back to the bedroom. The soft overhead light let her see Patricia sleeping on, mask over her eyes, and a naked and very erect Alex at her side. With remarkable grace he crawled onto the bed and used his claws to tear open Patricia's pajama bottoms, revealing the familiar sight of her pussy. Alex turned, winked at Alyssa and Carla and dove into the task at hand, sucking and licking slumbering Patricia, who was surely infected now.

Alex's hands reached under Patricia and fondled her tight ass, toned from regular spin sessions at their gym. Carla dragged Alyssa closer to the show, where Patricia at last began to stir.

"Oh, baby, someone couldn't wait. But this is so nice," she said. "It's been so long since we did it before work. Oh fuck, your tongue is amazing today! I can't wait to make you scream for me."

"Then let's take this up a notch," Alex said, flipping her over and pulling her ass up to him. He plunged his engorged cock into her as he held onto her torso.

"Alex?" Patricia belatedly asked, pulling off the mask. "Oh no, oh fuck. Why does it feel so good? I can't, we can't, oh fuck fuck FUCK!" She turned and saw Carla's new guise and panic in Alyssa's brown eyes. "Baby, get out of here! There has to be a chance."

"Aw, you sure you don't want some more of this?" Carla asked, her hands finding Alyssa's tits under the nightie. "You just said you wanted to make her scream." Carla cupped her prey's sex, the gown tearing under her clawed hand. "Maybe I should warm her up for you," she said, slapping Alyssa's pussy and eliciting a yelp from the pigtailed blond. "If you can drag yourself away from my man's meat."

Patricia indeed looked to be surrendering to the infection, her hands bunched in the comforter to drive her back into the pistoning Alex. Her skin was flush and shining and her black bob shook with the rutting. "So fucking good, so hot, don't fucking stop. Oh, fuck, baby, so fucking horny, I'm on fire."

Alex, apparently, had other ideas, since he picked that moment to, well, stop. He pulled out of Patricia and stepped back. She scrambled up and tossed him on to the bed, where she promptly impaled herself on his bobbing weapon. "Fucking need this, so good, so deep, can't stop," she babbled.

"Well this is quite the show," Carla said, shortly before Patricia ripped open her top and freed her bouncing tits, which definitely had more heft than the day before. "But enough watching for you," she added, pushing Alyssa onto the bed as well. "What now, though?" she said to no one in particular.

"F-Fuck her," Patricia said from behind them. Alyssa turned and goggled at her wife's rosy D cups and the nubs on her head as she continued to ride Alex.

"How kinky," Carla said. "I guess we have a little play date then." She leaned in and pulled Alyssa into a kiss, and the blond's head swirled. Impossibly, something long and thick slid into her, which she realized was Carla's cocklike tail. She moaned as Carla pumped her and her wife kept up a stream of filthy talk atop Alex. All hope was lost, so why was she so turned on? She pulled Carla in for another kiss and wondered what a threesome would be like with Patricia. Alex could join, too, since her wife seemed obsessed with his cock. Maybe she'd try it too while Carla fucked her up the ass with her tail and Patricia watched them. Alyssa shuddered as an orgasm rolled through her.

"Fuck!" Patricia shouted, and Alyssa turned again. Her wife wore an ecstatic grin on her perfect crimson face as she crawled to Alyssa. "Here, taste," she said, smothering her wife with her pussy laden with her tainted juices and Alex's black cum. Alyssa found herself lapping it all up while Carla continued to plunder her own pussy. It was glorious, and soon enough she had fucked her soul away just like Patricia.