The plot!

"Of course, I want!", Xandra smile happily, but deep, in her mind, laughing wickedly. All she wanted, was power of demon, which will try to posses her, but which she'll use for her own benefit, instead. But for now, she needed to pretend, she really wanted to be vampire. That's why she asked:

"But I see, you're as horny as I am... I have an idea - why won't we fuck this girl here, until she'll break apart like overused toy, and will beg us to end with her... Or even to turn her vampire?"

The idea almost made vampire cum again, as she thought possibility over. This was all she wanted - Slayer, broken, turned into her own ****, or even better - enslaved offspring. Aroused beyond any reason, she quickly approached Buffy, then grabbed her head, shoving her whole man-meat, deep into Slayer's throat. Buffy awoke instantly, and in first attempt of defense, she bit cock in her mouth, but vampire's skin was too thick and hard to make demon even feel any real pain. Instead, vampire just moaned, as this stimulation aroused her even more. Unable to observe any second longer, Xandra moved to Buffy, too, and lowered her head to her crotch, removing Slayer's tight panties in meantime. Xandra sighed with surprise, as she saw powerful, twelve inch long, and two inch thick cock, proudly in place of Buffy's clit. Xandra looked in ave, thinking if she'll be able to swallow this rod whole. There was only way to figure it out, so she slowly lowered her head, and started to lick, and finally, slid Slayer's thick cock into her mouth, and then, to her throat. Buffy stiffened, as she felt unfamiliar, but overwhelmingly pleasurable feeling in her groin, making her fear dissolve, and lust build up. In few seconds, of Xandra's perfect ministrations to Slayer's rod, Buffy found herself enjoying the whole ordeal, to the point, she stopped to bite, and **** out cock invading her mouth, but started to please it as well, feeling, she need to repay the girl doing the same to her. In few minutes, of such frenzied face-fucking, dickgirl trio finally cum, spraying each other with semen. Buffy, breathing hard watched lustfully at two dickgirls, plotting their next move. Finally, Xandra decided:

"I'll ride this wonderful piece of meat, while you will fuck her. As we cum, you'll grant me my wish, and then...", Xandra left the sentence unfinished, to not scary Buffy, and avoid her making something stupid, but Buffy wasn't listening to them, with her eyes wandering from hers, to their cocks. Vampire nod, accepting Xandra's proposition, and waited, as petite girl mounted gargantuan cock, making Slayer moan with **** pleasure, then approached duo, driving her whole nine inches into Buffy's snatch. Xandra was in heaven riding Slayer's meat, and with almost childish joy, she explored Buffy's body with her hands, especially, her small, but round tits, which she instantly started to massage, and pinch her nipples occasionally, as her vampire lover done the same. Even as she cum minutes ago, Slayer was already on the edge, as she felt **** pleasures of being fucked, while petite goddess rode her cock. With scream of pleasure, she flooded, Xandra's snatch, triggering her own orgasm, and clenching unconsciously vampire's cock with her pussy, triggering her orgasm too. As trio screamed with passion, vampire shown collapsed on Xandra's body, her mouth instinctively found girl's neck, then she bit hard. Xandra screamed, ass sudden pain triggered another orgasm, and allowed her pleasure, and vampiric embrace overtake her... To a limit. When she felt demon's being starting to duplicate in the vampire's body, she instantly used the spell she prepared for this occasion. With muffled shriek of surprise, brown-haired vampire felt her inner demon being sucked out, with all it's power and experiences, as she finally found the way to untangle from Xandra's and Buffy's bodies, and jump away. But it was too late - Xandra swallowed whole demonic being which replaced girl's soul, and now watched, as with face of terrified understanding, the vampire turned to dust. But that was only first part of her plan. With moan, Xandra started to ride Buffy's cock again, as she felt her soul fighting with the demon for domination. Normally she wouldn't stand a chance, but her new powers allowed her soul to swallow demonic being whole, absorbing all it's powers, abilities, and memories. With shudder she welcomed new changes to her body. She felt her fangs growing long, and extremely sharp, her muscles develop in a ways impossible for any human, giving her enormous strength, agility and reflexes, while also changed her body, making her new musculature greatly accentuate her feminity. She felt also twitching in her groin, as her cock grown to impossible sixteen inches, and developed thousands of pointy nodules on it's surface, hard enough, to allow extra stimulation, but also soft to the point, it won't hurt physically person penetrated by this monster. As her transformation was complete, there also came awareness of her new powers and abilities. She was now being of immerse magic power, able to feed on blood of others to replenish, or enhance it. All victims, bitten by her have small chance of developing into creature like her, but if they won't prove to be worthy, instead will be turned into obedient sex-slaves, craving for their mistress cum. Satisfied with these revelations, Xandra looked down on Buffy, to found helpless girl shocked by her change. Xandra smiled wickedly revealing her impressive set of fangs, and feeling intense pleasure, of Buffy's fear. Xandra looked at her victim unsure what to do next, then decided to...