Rarity wasn't quite sure when she'd last denied any of her friends anything. All she knew was that the slow, gnawing, worry that they'd leave her for a better friend had pushed her to never deny them anything. One day, she was struggling to make dresses for each of them to wear to the Grand Galloping Gala and the next day, or at least it felt that way, she was their favorite pet... maybe not even a pet. She wondered, sometimes, if they thought of her as more of a toy than anything else now, but at least they'd never leave her. She knew that now, now that they each had her completely, now they'd never leave her behind.

"Rarity," Twilight's voice broke her from her reverie, "are you getting the books shelved or daydreaming?"

"I'm shelving them," Rarity replied, "but do I have to do it wearing this?"

Rarity was dressed in a tight fitting French maid's outfit and while she was used to not wearing any clothes at all, something about this outfit made her feel more completely exposed than any day she'd spent naked in the sun. She wondered if it weren't so much the outfit as the way Twilight looked at her while she wore it, but some small part of her still stirred with excitement beneath the burning shame every time Twilight looked her way.

"First of all, 'I'm shelving them' what?"

"I'm sorry... I'm shelving them... Mistress," Rarity said and blushed deeply.

"Thank you, Rarity." Twilight smiled, "And secondly, you do want to make me happy, don't you?"

"Of course, Twilight, I want all of my friends to be happy."

"Well, watching you shelve books with your teeth instead of with magic while wearing that outfit makes me very very happy. Besides, it says right here in 'Proper Care Of Your Submissive' that you should be forced to wear things that make you feel embarrassed."

"You're right, Mistress," Rarity said quietly and started shelving books again.

Twilight seemed completely delighted to stare at her flank as Rarity climbed ladders and stooped low to shelve the books. She even pushed a few off of shelves and demanded that Rarity shelve them even lower and, "More slowly this time," a few times.

When Rarity had finally shelved the last book, she felt the now familiar weight of Twilight pressing up against her side and heard her breath in deep and slowly before letting out a nearly guttural sigh.

"Ah! I love it when you smell like sweat and the dust of old books." Twilight said breathily, "Do you want you're reward now?"

Rarity knew what Twilight meant by "reward" and she felt all four of her knees try to collapse with the anticipation.

"I- Ye- Yes, Mistress," she stammered out.

"Then come up stairs quick!"

"Can we put a curtain around the bed this time? I don't know if Spike should see-"

"He likes to watch. You know that. You don't want him to see something he likes watching? Is that it?"

"Oh, no. No. If he likes it... I just... no it's okay. I don't mind," Rarity quickly capitulated.

"I'll tell you a secret, but only because you were extra good today, I sent Spike over to Pinkie Pie's for a sleepover tonight. So I've got you all to myself," Twilight said and flashed a wicked smile back at Rarity as she climbed up the steps to her loft bedroom. Rarity bounded up the stairs and pounced into the bed next to Twilight, burying her head in the soft fur between her friend's front legs and nuzzling in close before looking up into her eyes.

"Thank you so much Twili- I mean Mistress. I promise I'll do anything you ask, anything, tonight."

"You would have anyway," Twilight said playfully, "but I'll make sure your enjoy it. Now, kiss me."

Rarity darted upward and pressed her lips to Twilight's. The first time she'd kissed one of her friends it had been Dash. Dash liked rapid fire kisses that felt more like wild hopping giggles than kisses. Twilight though, Twilight loved the slow and deep kisses. The first time Twilight had asked Rarity for a kiss, Rarity had given her a quick peck on the lips, but Twilight had pulled her back and pressed her tongue deep into her mouth. That first kiss lasted longer than any kiss Rarity had ever had before and seemed to somehow pulse through her entire body with each delicate flick of the unicorn's tongue. Twilight always tasted a little bitter, like tea that had steeped a little too long, but that bitter drink, Twilight's kisses, always left Rarity thirsty for more.

Twilight moaned as they parted and then whispered, "You're body always gets so hot when we do this. I wonder if increased body temperature is normal."

"I don't know if what we do is normal," Rarity said softly.

"My book says it's perfectly normal. Speaking of my book," Twilight paused as a playfully wicked smile spread across her face, "It says that biting can make things more fun. That it'll 'increase the fervor of the senses' which I think sounds amazing. You'd like to try it? Right?"

"I- Biting? I don't know..."

"I'd like to try it. Let's try it. You won't tell me 'no,' will you?" Twilight looked as if she were on the brink of disappointment.

"No, of course not. If you want to bite me or have me bite you. I will. Of course."

"Fantastic! It says the biting should be a surprise. So I'll surprise you. Okay."

"Yes. Yes, Mistress."

Twilight smiled and then leaned in for another kiss. Her hooves roamed Rarity's body as she slowly peeled away the French Maid's costume. Twilight left the frilly skirt and the long black socks on her, she seemed to really like it when Rarity was dressed in nothing more than a skirt and socks. Last week it was a cheerleader. Rarity couldn't help but wonder if the other ponies in Ponyville were starting to talk about her Monday night visits to Twilight's Library. She tried to be discreet, but one can only be so discreet while wearing a rain coat on a perfectly sunny day, and the rain coat was necessary. The book of special dress designs that Twilight had given her to make costumes for their "experiments" as she called them were things that Rarity just simply could not bring herself to wear outside.

"Rar- Uh- Rarity, let me have you. Come on. Let me have you, NOW." Twilight panted.

Rarity kissed down Twilight's chest, past her soft purple belly, and then slowly to that sweet salty spot between her back legs. She licked softly at first and slowly brought her own hind quarters around, placing her dripping sheath above Twilights quickly probing snout and tongue. Twilight loved slow kisses on the lips, but she always lapped at Rarity like a dog that hadn't seen water in days when it finally came down to this.

Rarity moaned into her friend's lavender muff and started to lose herself in the now familiar flow when a sudden burning pain in her thigh pulled her back and she gasped with surprise. As the near dream state slipped away she realized that Twilight was biting into her soft inner thigh, but just as quickly as she started, her teeth released again. Twilight slowly licked the now red and sensitive skin and each flick of her tongue sent a wave of both pain and undeniable pleasure up her leg, her spine, upwards until it seemed to explode in her throat with guttural moans and sharp whimpers.

"You like that, don't you?" Twilight asked her.

"Oh. I- I don't know," Rarity said slowly through panting breaths.

"You don't know?" Twilight asked as she bit into Rarity's other thigh and then again kissed and licked the welts, "I think you like it and you know you like it. Tell me you like it!"

"I like it. I really really do! It's like you're turning my nerves on. Like my skin hasn't felt anything before. Please. Please, again. Please," Rarity begged.

"If you insist," Twilight said and bit harder still into Rarity's willing flesh.