Ask Buffy to clean up...

Xander looked down at the sisters as Dawn continued to play with his cock, licking her lips and relishing the flavor of the cum within reach of her tongue.

Buffy continued to slide her finger slowly in and out of Dawn's moist slit as she stared intently at Dawn's cum covered face. With her free hand she softly fondled her tits, scooping up the cum from Xander's last blast.

Dawn shivered with pleasure and suddenly began stroking Xander's cock faster as she looked up at her sister's face. The girls stared into each other’s eyes as Buffy reached her cum covered fingers toward Dawn's mouth. Dawn leaned slightly forward, a gentle mewing sound escaping from the back of her throat as she took Buffy's fingers into her mouth, nursing Xander's cum from them, and savoring in her mouth for several moments before swallowing the sticky hot seed down her throat.

Xander moaned softly at this display and decided it was time to again assert his dominance over the sisters, "Buffy, your sister may look great with all that cum on her face, but if she's to continue her lessons, she's going to need to be cleaned up."

Buffy grinned slyly up at Xander as she continued to gently fondle her sisters slit, "Mmm... of course... Master..."

This last word startled Xander a moment; he had read powers such as his can work more strongly for some people then others, and hearing Buffy address him as, "Master" made his heart skip a beat for just a moment, as he realized that not only does his new power work better then he ever could have hoped, but that he could possibly make his effect on Buffy and Dawn permanent, that his control could remain even if he somehow lost his powers.

Buffy turned her attention back to Dawn and began to slid her finger farther into her little sister's slick hole, and as she began to lean closer and closer to Dawn, she could feel her sisters juices flowing out and practically soaking her hand. Buffy drew closer to Dawn's face, stopping for just a moment mere inches from her sister, inhaling deeply of Xander's scent and feeling her own juices dripping down her legs.

Dawn softly bit her lower lip, and then let out a gentle sigh as Buffy stretched out her tongue and began to lick Xander's cum from off of her face. Fully lost in her sister's actions, Dawn absently ceased her ministrations of Xander's cock, letting her hand fall limply to her side.

Xander reached down and began to stroke himself as he watched Buffy carefully cleaning every drop of his cum from her sister's face. Once Dawn's face was nearly half clean, Xander quietly whispered, "Don't forget Buffy, if we're going to train Dawn to be a proper little slut, we need to make sure and teach her to share..."

Buffy moved back only slightly from her sister's face, her mouth forming into a sly grin, huge dollops of cum practically coating her lips and still extended tongue. She leaned forward towards her sister again, moving closer as Dawn's mouth slowly, almost instinctively began to open, tentatively allowing her big sister's cum-coated tongue slide inside.

Xander felt his cock growing stiffer as he watched the sisters kiss. As Buffy gently, almost reluctantly broke the kiss and moved her lips back from those of her sisters, they remained momentarily connected by a small strand of saliva and cum before Buffy whipped out her tongue and drew the faint remnants of Xander's seed back into her mouth.

Just as Xander was about to give the girls his next command, Buffy looked up at him with a near fanatic look in her eyes and said, "Please Master, you have to fuck her now. She needs to know what it feels like to have a big thick cock like yours inside of her..."