A Sister in Sin

"I could do so much to you Morgan. I could consume your soul, everything that makes you you, and leave nothing but a husk behind." Allegra traces a finger capped with a long, sharp fingernail across your body as she speaks. "I'm sure your soul would empower me greatly but that seems like a waste doesn't it? I could enthrall you, keep you as my personal fucktoy, I considered that for awhile..."

"Allegra this isn't-" Before you can finish she places a finger in front of your lips and shushes you before she returns to her speech.

"As fun as it would be to have you serve me eventually you would grow old. No, I want you for the rest of eternity." She kisses you forcefully on the mouth, some of her saliva entering your mouth before you close it. The taste is shockingly sweet, almost like candy if candy made you feel hot and bothered. You try as hard as you can to resist your friend but not only is she stronger than you she also seems to know exactly where to grab and tease to make your libido soar. Suddenly you feel something enter your snatch just as you wonder why she was ignoring it, something almost phallic - her tail, it has to be. It's all too much and you cum with a loud cry that is quickly overtaken by a sinister laugh.

"Well I'm happy I got to be your first Morgan, even if you didn't last very long. Not that it matters, your fate is already sealed my love. Why don't you take a look?" Allegra releases you as she speaks, a sly smirk on her face. You look down in confusion as her tail waves around, white juices dripping from it. There's a pink light just above your crotch that slowly fades, as it does you see a black marking not unlike the ones on Allegra - she even motions to a similar marking in the same position.

"That's proof you enjoyed our little tryst, no matter how much you might like to pretend otherwise. A crest of demonic lust that will erode your soul and twist your body with every little feeling of pleasure until you're another slutty succubus, just like me. So go if you want, I won't stop you because eventually you'll come back to me. Of course..." She poses seductively for you. "I can make your fall into sin an experience of pure bliss, all you need to do is to submit to me."