Two demonic sisters and a cousin

"Ready for round 16?" Harley asked, insatiable. She and her sister had fucked in every way imaginable and were cuddling lovingly in the cum-filled carpet when they heard a noise coming from the other side of the room. It had been hours since their transformation, and by now all demons but them had moved on, so they stood up on alert.

"I think it came from there", Yara commented, pointing to the closed wardrobe where guests would leave their coats and bags. Both of them approached it as stealthily as they could, not making any sound save for the slapping of the eldest sister's wet cock against her thighs.

When they arrived at the door, they could hear the rumble of moving cloth inside. Yara took a deep breath and tensed her muscles, ready to pounce as soon as she opened the door. She was about to jump in when she saw her.

"Alicia?"

Inside, a blonde pale girl in her mid twenties was roaming through the pockets of a heavy fur coat when she turned around abruptly, startled. "Ha-Harley?", she asked fearfully, recognizing only the youngest sibling, the one least changed during her corruption. "Oh, no. They got to you. That monster got to you!"

"Monster?" Yara mockingly protested in her husky, ever seductive voice, taking a hand to her hips. "Is that the way to treat your cousin, Ali?"

"What? No. No! That can't be you, Yara, it can't!", she stumbled backwards, terrified at the realization. "You're so..."

"Sexy? Thank you, I think so too. And so does Harley," she slapped her sister's ass as she gave her a long kiss with her serpentine tongue, which the corrupted girl eagerly accepted. "You know, sis, just as I thought I was getting tired of fucking your pretty pink pussy, a new opportunity arrives"

"What? No! No, don't get that thing near me, please!" she pleaded, observing the rising erection in Yara's crotch.

"How dare you, Alicia? You think I would **** my own cousin?" Of course she would, but that wasn't the plan she had in mind. "No, I just want you to watch so you can see what you're missing out on."

And, just like that, she rapidly grabbed Harley by the hips and, with no hesitation, pulled her in front of her and pushed her hard cock inside her pussy. The younger demon gasped, surprised, but in a second she was already moaning like a bitch in heat as she looked to her cousin straight in the eyes. "Oh, fuck! Fuck me, sis! Fuck me harder!"

Yara complied, winking at the incredulous Alicia as she plowed her sibling like she had never done before. She had to put on a good show, after all. "Stop! Stop!" the girl begged from inside the wardrobe. She would have attempted to flee, but the two Succubi were covering the only exit available. "This is wrong, this is so wrong!"

"Yes. Yes, it is, Ali," Yara agreed as she grabbed her sister's bountiful tits, presenting them to her cousin. "And that's what makes it so right."

She had gotten so worked up with the looks of her unexpected guest that before long, she could already feel her corrupting cum stirring inside her. "Fill me, sis! Fill my pussy again!" Harley squealed, lost in her lust.

"Don't be greedy, sis. We have to share with our family!" Yara shouted as she pulled out just in time to point her cock at the direction of the blonde girl, who didn't have time to cover herself before she was showered from head to toes with the spunky cream, some of it entering her open, shocked mouth.

Harley was completely disheartened at the fact of not having been gifted more of her sister's prize inside her, but quickly changed her heart when she heard the first moans coming from Alicia's lips. "I... I feel so weird... I... Ughhh!" She clenched as her transformation began to take hold. Her tight red dress was completely unable to contain her growing body, being ripped apart piece by piece as her breasts inflated to a nice pair of melons and her ass and hips exploded outwards giving her a nice hourglass shape.

"Ah... More! More!" she requested, and her body complied, as the final strings of her dress were ruptured by the massive cock that had sprouted in her crotch, pulsing wildly with each heartbeat and dripping its wicked pre-cum.

With horns and a pair or wings growing out, and her skin turning into a light shade of gray, her corruption, both physical and mental, was complete. "Amazing... Thank you," Alicia sighed, content.

"Anything for our family," Harley smiled as she got on her knees and admired the magnificent body of her cousin from below, ready to show the same kind of love to her cock as she had done with her sister's.