A woman comes through the door

Regrettably, you didn't have time to enjoy your new succubus sister's body, as you heard a back door opening and then firmly closing, followed by the heavy breathing of a woman and footsteps heading your way. Worried that it might be a priest or nun who might still have some power to combat you, you ordered Kristen and Mary to hide in the small bathroom next to the office you were in.

You had barely managed to hide out of her sight before the woman entered the office.

"Hello? Father Tom? Anyone?"

You grinned as you realized your fear had been for naught. You easily recognized the voice of the new visitor as Doctor Amelia Simmons, a regular churchgoer in her late 30s who had probably decided to come here for protection. Well, she was about to find something else.

Confident that she stood no chance against the three of you, you opened the door and stood there, waiting to see her reaction. She could have tried to run, but you knew she stood no chance against you. She wasn't leaving this place without a healthy dose of your corrupting cum inside her.

And yet, she didn't attempt to escape. She merely looked at you with her big blue eyes, with a mixture of astonishment and awe. Your pheromones were already doing their part to increase her arousal by the time that Kristen decided to break the silence.

"Hi, Doc!", your sister greeted her, a devious smile plastered in her face "Is it time for our yearly checkup?"

"M-Mary? K-Kristen?", She stuttered, staring at your sinfully flawless bodies. "What happened to you?"

"Oh, I was hoping you could tell us yourself", you answered, swaying your lovely hips as you approached her. You were surprised to see she hadn't even flinched.

You got a chance to get a closer look at her now. You could see she was a decently attractive woman, with blonde straight hair and blue eyes, yet time and stress had taken her toll on her skin and body. It was clear, however, that she had probably been very desired in her youth, an opportunity you could exploit.

"I think I can describe the symptoms", you continued. "Enlarged breasts, weight loss, expanded buttocks and...", you came closer to her ear to whisper the last words "...really wet pussy"

Your sisters came forward as well, showing their enhanced bodies to the woman and taking positions surrounding her. "Our pussies are soooo wet too, Doc"

"Be careful, though.", You muttered "I think it might be contagious. And surely a pious, devout woman like you, wouldn't want a sexy, perfect body like ours, right?"

You could sense the woman's resolve lowering as memories of her past came to her. The one that lingered the most, however, had been one where her boyfriend has called her "the hottest girl on campus" while they were having sex in the football field. And the memory of him abandoning two years ago for a younger woman...

"All it would take is one small kiss...", you whispered as you got your lips closer to hers, so close that you could smell her sweet perfume now. She closed the deal, kissing you softly at first but then pushing her tongue into your mouth, pressing against your own.

A moment later, your sisters got the woman out of her clothes with surprising agility, leaving her bare naked in just a couple of seconds. They were already wet picturing in her head how her new sister would turn out, and soon began to caress her body, planting kisses in her neck and eventually sharing her mouth with you.

She needed more however. She needed to be corrupted. She needed to...

"Fuck me. Please", the woman said, pleading at you as she stared into your dark eyes. "Please. I need to..."

You didn't wait to hear her finish her sentence, as Kirsten and you plunged your tails into her ass and pussy. The doctor moaned hard, grabbing hold of your horns as you began to fuck her, bringing her closer to her destiny.

Mary hadn't been idle either, as she pushed her claw against the blonde's clit, rubbing closer and eliciting louder sounds from her.

You kept going for minutes, enjoying her corruption. Her eyes lost their color and became black pools and her skin took a crimson shine.

But what she has desired more had yet to come. "Please! Make me... Make me fucking hot!" She screamed as she climaxed, triggering your own orgasms which overflowed her cunt and ass with your dark cum.

"Become"

She rejoiced as immediately her body began to reform, the small wrinkles in her skin disappearing, leaving her looking like she was 10 years younger yet with a mature look that your little sister didn't have. The rest of her body followed, her body improving in every way to become a sexual goddess. Her ass plumped, her waist cinched and her breasts swelled to a DD cup, bigger and firmer. Her last demonic features appeared, as her horns and tail grew out of thin air and her tongue extended and became serpentine.

She felt more energetic than ever. More seductive. More powerful. The old Amelia Simmons was gone. A new servant of Lilith had replaced her.

In her mind, there was only one thought. To bring corruption to every being in this world, to transform them into the lustful demons that they should be instead of their weak human form.

A plan began to form in her twisted head. She imagined returning to the hospital where she worked and turning all those innocent nurses into her perfect sluts all in one go in their break room. And her friend, Doctor Alexa Li, could use some physical improvements as well...