Destined for Dawn

Buffy looked more than consternated. She seemed outright in shock. 

Dawn tried to make it easy for her. She felt a bit guilty, having been the cause of Buffy’s confusion. She hadn’t really meant to. She’d just been daydreaming—thinking up possibilities, scenarios. But because she was the Key... all that magical energy that made her up could do a lot of damage if she wanted it to. If she wanted it to badly enough. 

And apparently, she wanted Buffy badly enough. Why shouldn’t she? After all, Buffy wasn’t really her sister. They just thought they were related. And weren’t there studies that people were so deeply attracted to their own family members that there had to be an incest taboo in place to keep them from acting on it? Dawn just didn’t see any need for that taboo to apply to her. If nothing else, there was no risk of having kids. Even their ‘family’ wasn’t messed up enough for that.

“Dawnie,” Buffy began. “There’s, uh… there’s something I think you should read. Yeah, I think it would be easier if you read it for yourself.”

She held it out to Dawn—a stack of papers clipped together by a staple. On top were photocopies of the kind of ancient texts Dawn was used to seeing at the Magic Box. Shuffling through them, Dawn reached the modern translation. Dawn didn’t have to read it, she knew what it said. Exactly what it had in her fantasy. 

Dawn read through it anyway. It seemed so impossible, she needed the reassurance.

“It says that for the Slayer to defeat… well, Glory… she needs to submit to the Key.” Dawn looked at Buffy and added breathlessly, “Submit how?”

“Sexually,” Buffy answered her. “It’s sex magic or symbolism or… it has to be real, I guess. There’s not a lot more real in the magical world than. Than being intimate.”

“We have to have sex,” Dawn said. She tried to keep the excitement out of her voice. Buffy was so beautiful. It really was a privilege that this form Dawn had ended up with had been made to look so much like her.

Buffy nodded. “The prophecy is… it’s pretty specific. I know it’s so much to ask and if there were any other way—”

“But it’ll stop Glory, right?”

“We think so.”

“Well…” Dawn hugged herself, making a show of her reluctance. “If we had to kiss to beat Glory, we’d do it, right?”

“Of course, but this is—“

“And if we had to touch each other to do it, we’d… touch each other.”

“This is way past that, Dawn.”

“I get that, Buffy, but it’s all a matter of degrees. And it’s so much better than someone dying or losing a hand or anything like that. I could even make it feel good for you, maybe. That’s not so bad, in the grand scheme of things, is it?”

“No, but Dawn, this is your first time. It should be special…”

“Then don’t ruin it by acting like we’re stepping on a puppy,” Dawn said firmly, her arms held tightly at her sides. “If we both just try to enjoy it, then I get to remember my first time as helping you save the world. That’s something, isn’t it?”

Buffy lowered her head. “I just want you to know that I’m not doing this lightly. I’d rather lose a hand than ruin your…”

“And I’m telling you that I don’t want to hear you talk like that anymore. And you have to listen to me.” Dawn reached out, her fingers under Buffy’s chin to lift her head back up. They faced each other. “I’m the Key. And I want to give you a tongue bath.” 

Her tone was sensual, husky, demanding. Just what Buffy would want to hear from a lover. She shuddered, not expecting to be so aroused. Maybe the Prophecy was helping her out, turning her on despite herself. Or maybe I’m so incredibly fucked up that even this I can get used to. 

Dawn leaned close to Buffy, to the supple hint of cleavage that her low-cut top provided, all the smooth contours of her shoulders that her spaghetti strap tank top left nearly entirely bare, but what really drew her in was Buffy’s slender, velvet-smooth neck. 

She licked out with her tongue, drawing it over Buffy’s tawny skin, the light sheen of sweat that had already sprouted—excitement and anticipation and a little fear of whatever this was. Liking the taste she found, Dawn kissed down Buffy’s collarbone, the creamy skin infinitely slippery, letting her slide right down her chest. 

Neatly, Dawn tugged Buffy’s shoulder straps away, letting the top fall down to her hips and leave her breasts exposed. She kissed each golden mound, leaving saliva after her lashing tongue. Then her puckered lips sucked at the swollen nipples. 

Dawn knelt, moving her hands to Buffy’s capri pants. They were tight—Dawn had to unbutton the fly and draw down the zipper—but Buffy’s hips were slender, girlish, and let both her pants and panties down in one smooth motion. Buffy’s stomach was sweet, supple, her abs somehow cute and feminine, all the way down to the neatly shaved thatch that crowned her toned thighs. 

Obligingly, Buffy stepped out of her pants and underwear, complying with Dawn with a sort of dazed reluctance, like a dog doing tricks that were half forgotten. But she wasn’t resisting. Dawn thought she didn’t even want to resist. 

Her tongue swirled around Buffy’s navel, touching the striations of her tensed muscles before gliding down into her thatch, laving her saliva on the already wet pubic hairs that tasted of Buffy’s essence. A taste beyond even Buffy’s sweat. 

Dawn’s hands moved over Buffy’s legs, smooth and creamy, while her mouth moved down to Buffy’s bare feet. She kissed them, sucked at Buffy’s toes, and Buffy could only moan as she stripped her top the rest of the way off. She was now totally naked, electric sensations rolling up her spine.

“Dawnie, this is…” Buffy’s voice hitched. “This is… maybe we should… Dawn, this shouldn’t feel this way.”

“Sshh,” Dawn hissed, placing her hands on Buffy’s hips, turning her gently around. Buffy went softly along with the motion Dawn prescribed for her. “This is what I want. I want it to feel good. You deserve to feel good, Buffy… so good…”

Dawn stood up behind Buffy, tracing her fingertips up the backs of Buffy’s legs, over her pert little ass, and along her smoothly muscled back. She squeezed Buffy’s shoulders, massaging them, and Buffy cooed as the tension fled a short distance away. She didn’t want to be all tensed up and anguished. She wanted to keep feeling good, but when Dawn’s wet tongue ran over the back of her neck, she didn’t know how to accept it. It was so wrong. It felt good, but it was Dawn, her sister. 

And her sister’s warm tongue floated softly down her spine—down the valley between her buttocks. Then Dawn kissed either asscheek, licked them, bit them playfully. Buffy had a small but nubile ass, the flesh curving like a berry, ripe and juicy but just a morsel. Buffy was unused to having her trim ass played with, pleasure being generated in that neat, tidy curvature. Then Dawn pried apart her buttocks and ran her tongue into the crease deep between them, finding her puckered sphincter and pressing the tip of her tongue into it. Buffy let out an inadvertent giggle.

“Dawnie, that feels…” Buffy trailed off. “Keep… keep doing that. Don’t stop. Jesus, Dawn, you’re my sister…”

Dawn probed her tongue into her sister’s anus as far as it could go. Buffy couldn’t keep from wiggling her hips, encouraging Dawn to continue the rimjob. Dawn sucked and licked and smacked her lips, both feasting on Buffy’s delectable little hole and preparing it for what was to come.

Buffy laughed louder, her laugh becoming raucous and coarse as Dawn kissed Buffy’s asshole harder, held her cheeks a painful distance apart to drive her tongue in as far as it would go. Bathing the little pink opening in her saliva. Buffy’s eyes rolled back in her head. She no longer had the wherewithal to realize that she had gone from tolerating what Dawn was doing to enjoying it—wanting even more.

Dawn stood up behind Buffy, leaving her asshole wet and splayed… panting in anticipation of what more she could do to it. “I want to fuck you in the ass.”

“In my ass?” Buffy squeaked, surprised.

“You have to submit to me, don’t you? There’s not much more submissive than that.”

Buffy’s head trembled—both nodding and shaking her head at the same time. The text had said that, but it had seemed so much more abstract before Dawn had stripped her, started touching her. Now she knew she had to actually go through with it. 

That she might enjoy it.

“But… but… I mean, how?”

Dawn kissed Buffy’s shoulder, nuzzled her nose against Buffy’s neck. “I got a package once. I’m pretty sure it was supposed to be for Willow and Tara, but once I opened it, I was too embarrassed to give it to them, so I just… kept it. I guess it’s fate.”

That was total bullshit. Dawn had swiped the strap-on when she was pissed at Willow and Tara for something she’d now forgotten. They’d never asked her where it had went and she’d never felt the need to put it back. That’d been a month ago. She’d started masturbating by wearing the strap-on, jerking it off like a boy, grinding the base against her pussy, pretending that she had Willow bent over for her, or Tara… finally, the fantasy had been Buffy, and she’d enjoyed it like that too much to come any other way.

“Get down on your stomach and spread your legs.” Dawn gave Buffy a shove towards a nearby daybed. “I’ll be right back.”

She left. Buffy obeyed her, heart pounding, the feeling of being naked—the room’s cool air on her bare skin—suddenly seeming to echo inside her. The thought of Dawn fucking her in the ass was insane, but the feeling of how good it had felt to have Dawn’s tongue flowing through her asshole was fresh and vivid in her head. Maybe it’d feel good… even as good as the usual kind of sex. She’d never exactly submitted to Angel or Riley. Something in her had always taken charge, or tried to take charge. This would definitely signal that she wasn’t in charge…

Dawn came back. All she wore was a strap-on, a black harness holding a long pink erection at her crotch. In her hands she had a jar of Vaseline. Otherwise, she was entirely naked. Her body was as willowy as Buffy’s own, but without the added muscle, the thickening of maturity. Instead, she was entirely sylphlike. Small, pristine breasts and a gentle swell of hips, speaking to her femininity in elegant teenage miniature. The most voluptuous thing about her was the long, unbound hair that cascaded down her shoulders, like a painting of Lady Godiva, touching her breasts more in caress than censorship. They seemed to frame how Dawn’s nipples were engorged.

Buffy nearly gasped. She hadn’t realized how beautiful Dawn had become.

“That’s good, Buffy,” Dawn said in her slow, hesitant voice, seeming as overwhelmed as Buffy was. Buffy wondered how she saw her; if both of them didn’t have some guilty arousal towards each other. “Thank you for doing as I said. You can’t disobey me like the Watchers. You have to do what I tell you.”

“Dawnie, please,” Buffy said haltingly. Maybe she was a natural submissive—the situation and the words turning her on, even though it was with Dawn—but getting off on having Dawn talk to her instead of simple biology and physics seemed even more wrong.

“I don’t think you should call me something that diminutive,” Dawn said. She held her strap-on in her hand, sounding firmer, more certain. “In fact, I think you should refer to me as Mistress.”

“Dawn, c’mon…”

“Mistress. Now.”

Buffy whimpered. The more she protested, the wetter her cunt got. Why had she been built to get off on something so… wrong? “Mistress. You’re my mistress.”

“And you’re my anal slut, Buffy. That’s why you’re going to get fucked in the ass now. Because that ass belongs to me.”

Dawn positioned herself between Buffy’s thighs, lowering her body down to Buffy’s as she guided her strap-on to Buffy’s quivering asshole. Buffy winced in anticipation of the pain she knew was coming. The dildo was as big as Angel had been and he had hurt just going into her pussy. Of course, he’d been taking her virginity, but Dawn was taking her anal virginity. The tip of the strap-on prodded into her asshole…

“Hhhuu!” Buffy mewled. “It’s too big… it’s not going in!”

“Oh, silly of me,” Dawn said, slapping her forehead. “Mistress forgot to give her little love slave the finishing touches.”

“Love slave?” Buffy repeated, only to feel Dawn’s hand smack against her juicy ass painfully.

“Speak when spoken to,” Dawn hissed.

She opened the jar of Vaseline she’d brought down and smeared the jelly all over her strap-on, then used the residue that had collected on her fingers to lubricate Buffy’s ass, pushing into the sphincter and circling her fingers all around the anal passage until she’d rubbed the lube deep into Buffy’s flesh. After that, she gave Buffy a more loving pat on the ass.

“Feel better?” Dawn asked, tapping Buffy’s other cheek to leave both anointed with Vaseline.

Buffy moaned appreciatively, squirming around to get used to this new slippery feeling in her anus. “Yeah… it feels much better this way, Mistress. I… I think I can take your strap-on now.”

“I know you can, sis. I’m going to make you take it.”

A smile flickered on Buffy’s face. It was still wrong, but she couldn’t bring herself to care. If this domineering anal sex felt as good as the prospect had made her aroused…

This time the strap-on went into her gradually, inch by inch making Buffy’s asshole open, seem to deepen with how it pushed inward. Dawn pressed down with her hips, her hand guiding the dildo into Buffy’s rectum, steadily deeper. The pressure of it built inside Buffy, scorching her tautly stretching flesh until she didn’t think she’d be able to take it. 

But it wasn’t entirely discomfort. Waves of sensual enjoyment blanketed her body with every inch Dawn fucked into her. The two sensations ebbed and flowed, jagged spikes of pain coupled with the most overwhelming pleasure Buffy could imagine.

The final few inches were the most painful, the most difficult, but with patience, Dawn was able to hilt the entire strap-on in Buffy’s ass. Then she fucked her slowly, hips swaying back and forth, enjoying the resistance of her asshole, the drag as the dildo squeezed through the tightly clenched flesh. 

Buffy went cross-eyed. The pain made it impossible to get used to the pleasure—it was a constantly springing surprise—her cunt throbbed harder than it ever had before. “Ohhh, Dawnie, that feels so good!” she gasped. “You were right, so fucking right! Jesus, it feels perfect!”

“That’s because you’re my anal slut, Buffy. Anal sluts love getting fucked in the ass by their mistress. Don’t they, Buffy? Don’t you love being my bitch, taking my cock, being ass-fucked like a bitch in heat!”

Dawn was slamming down into Buffy’s body now; Buffy lifted her ass to meet Dawn’s thrusts. And as Dawn rammed into her, she reached under Buffy’s body and fondled her cunt, slipping two fingers inside it to take advantage of how receptive the ass-fucking had made her sister.

“Dawn, I love it… Jesus Christ, I can’t begin to tell you… how wonderful… oh fuck… do that again, yes, THAT! Again—more—yes—really give it to me—fuck me harder, harder—FUCK ME LIKE A BITCH!”

Dawn was fucking her harder than Buffy had ever been fucked before. She could no longer imagine anything at all wrong with it; she loved every second of being ass-fucked. The pain hadn’t left the Slayer entirely, but now it was totally mixed with pleasure, creating a sensation that was easily the most intense Buffy had ever felt. Her head swam, feeling the ecstasy of being fingered in her pounding cunt as well.

“More!” Buffy keened. “More! More!”

Dawn rubbed at her clit, tugging it, pulling it, twisting it, driving Buffy insane with passion. She came, her cream splashing Dawn’s fingers, and Dawn thrust them deep inside of Buffy, to feel all the convulsions of her cunt as the Slayer got off on being dominated and ass-fucked by her own sister.

With Slayer stamina, Buffy’s asshole was still tightly knotted, though now that she’d gotten off, Buffy was insensate, eyes glazed and mouth open, even drooling some—little more than a snug grip on the strap-on, perhaps to hold it in place as Dawn rutted against it, getting off herself on the stimulation Buffy was so considerate as to provide, and ruining Buffy’s hole in the process.

Dawn grinned to herself and began to roll her hips. She would wreck Buffy’s asshole. Then she would make her anal slut thank her for it. And then Buffy could stop worrying about dating, because Dawn intended to keep her very well-satisfied. As satisfied as she herself would be, having a slutty sister with a tight little ass to fuck over and over again.