Bite her

Still impaled on Slayer's cock, Xandra stretched her body, allowing Buffy to observe, her overdeveloped musculature moving underneath her skin, revealing more, and more of her perfect body. Buffy looked at the girl sitting on her lap with fear, and ave, as she looked black-haired face lowering to hers. Xandra smiled again baring her long fangs, then with one, predatory fast move, bite Slayer's throat hard. Buffy screamed as she felt her life **** sucked away, and her body being invaded by demonic presence. Xandra withdrew from Buffy's throat, and observed, as Slayer's body started to twitch, when her entity fought with vampiric demon for dominance. Suddenly, Slayer's body arched, as she let out unearthly scream. Xandra observed with joy, as Slayer's body morphed - in few seconds, athlete body, of vampire's greatest enemy, developed into more muscular form, as her tits grew in size, reaching perfectly round DD set, while her waist thinned to impossible size. Xandra felt Slayer's buttocks growing, and rounding up underneath her, as the last change in Buffy's appearance came in her face. Xandra smiled victoriously, as she saw Buffy's fangs growing, and sharpening, her irises turning into crimson red, while her face features moved into pure perfection of her old look. Strangely, but Slayer's cock didn't grow in size even by inch. As the last change took place, Slayer's body relaxed, and she looked at Xandra, and said:

"Mistress, I'm at your commands."

For seconds, Xandra only stared at Buffy, not knowing what to say. Right now, her offspring was almost as powerful as her, and still, seemed to behave like obedient ****. Unless... Wicked smile came back on her face - it seemed, the siring still was the prime law for new generation of vampires, Xandra created. And Buffy, was loyal to her as all vampiric offspring was. Satisfied with this discovery, Xandra cut Buffy's ties with her claws, then sat on the floor, and ordered her offspring, to suck her enormous cock. Buffy eagerly obeyed, using all her skills to please her mistress, as Xandra started to plot. Her new powers were almost absolute. She could do almost anything, even to break contract with Willow, and turn her into obedient ****. Xandra grinned, as she thought about it. Still, she felt... thankful to the redhead witch, for her change and powers. It created a hard choice - to enslave redhead, and take all power for herself, or form even stronger alliance, by sharing knowledge of new vampire creation to the redhead. Nearing to orgasm, Xandra decided to...