Luna knew something was up. She could tell by Twilight's nervous face that Celestia was up to something. No doubt she was trying to get her claws into Twilight. It was annoying. Celestia was always getting her way. With men, with women, with her students. Celestia had favorable qualities of course. Kindness, Generosity, intelligence. However, her sister was also a glutton and a whore, taking any chance she got to fulfill her desires while still looking magnificent and managing to avoid negative stigma.
Luna couldn't get away with half of the stuff Celestia did. It was frustrating. Especially when Celestia felt the need to take all of Luna's crushes away from her. The two had been playing this game for a long time. This tale of Sisterly romantic rivalry. And in the end, Celestia seemed to always win. Even when Luna did strike a blow, Celestia struck one that hit Luna far harder, or won by not even caring.
This was where it would end. Twilight would be Luna's, and no one else's. But in order to achieve that, Luna would have to make her move now. She'd have to approach her now.
"Twilight. Your just who I was looking for." Luna said, approaching the girl. It was lunch and she was sitting with 6 of her friends. Applejack was notably absent. Luna had no idea what that was about, but her concern wasn't with the farm girl for now.
"Y-you were looking for me?" Twilight said, looking up bashfully with a slight blush. She really was quite adorable. Luna had to resist the temptation to lick her lips. It had been a while since she had someone, and she needed Twilight.
"Yes. I would like for you to come meet me in my office. I have something I wanted to discuss with you. In private." Luna said. There was something about abusing her power in such a way that felt quite thrilling. A tingle went through her body like a magical charge. Twilight gulped. Luna could tell that it wasn't simply anxiety about seeing the vice principal in her office. It was the nervousness that came with being asked to be alone with someone you find sexually attractive.
"O-ok. I'll see you guys later." Twilight said and got up. Luna was pretty sure a couple of Twilight's friends were shooting her a death glare. But she didn't care. She was so close.
Luna let her hips sway seductively as she guided Twilight to her office. When she was younger she tried dating to keep her curves in check. However, she noticed that Celestia would never do such a thing and got heaps of attention anyway. In the end, Luna accepted that having a big butt was often an advantage, not a detriment, though sadly her curves were never quite as appealing as her older sisters, at least so it seemed to Luna.
Still, she could practically feel Twilight's head and eyes follow every movement of her swaying rear, a fact that got Luna so very wet. It was going to be hard to play this cool. She sat down at her desk and gestured for Twilight to do the same. She nervously did.
"Thank you for coming. I believe that you have been training in magic with my sister, correct?" Luna asked.
"Uh...yes." Twilight said, with a nod.
"That's good to hear. After all it is important for you to do so. Life it seems is growing more dangerous on this side of the looking glass." Luna said.
"I...I've noticed." Twilight said.
"I'm sure you have. However, her instructions alone aren't going to be enough to get you to your full potential." Luna said.
"I-I'm not sure what you mean." Twilight said.
"I bet she's taught you the basics right. How magic works. How to concentrate your will. How to focus. How to power your spells and send them off in the world." Luna said.
"Th-that's right." Twilight said.
"I bet she's even taught you that lust can be used to power one's spells. Hasn't she?" Luna said. She was adopting a gentler, more sultry tone of voice.
"Y-yes." Twilight said.
"Thing is. It requires more than just base lust. It requires a certain amount of acceptance. Giving in. That's how you can truly come to define your magical style." Luna said.
"W-what do you mean?" Twilight said in a low voice.
"Well, you like girls right? Other women." Luna said.
"H-How did you..." Twilight asked.
"Do you have to ask? Your not very subtle about it are you? You check out every girl with a halfway decent bottom." Luna said. Twilight went red.
"I don't mean to embarrass you. I've called you in to help you." Luna said.
"He-help me? How?" Twilight said. She was trembling. It was so cute.
"Well, I wanted to help you to fully accept those feelings of yours. Fully embrace them the only way you can." Luna said. Then with fingers trembling with excitement, Luna began unbuttoning her blouse.
Twilight's eyes opened wide. She wanted to look away but she couldn't. Her eyes continued to gaze at Luna's beautiful skin and luscious breasts.
"Wh-what's happening?" Twilight said in a gasp.
"I'm showing you my body. You're interested in it, correct?" Luna asked.
"I...I..." Twilight said. Of course, her answer was all in her expression as Luna's bra fell to the floor. Twilight's lust took over from her nerves.
"It's ok. We don't need to have to do anything your uncomfortable with. You just need to look and feel how it affects your magic." Luna said, as she shrugged off her skirt. Then she stepped out of her panties and Twilight could see it all.
"I...Professor...I-" Twilight couldn't string together sentences. How could she in the face of that beautiful form?
"It's ok, Twilight. You can feel free to touch yourself. That will help the process." Luna said. Twilight frantically snuck one hand down her skirt and the other began playing with her right breast. Twilight shuddered in pleasure as she began playing with herself.
"Hold on. You look uncomfortable. You should take off your clothes. It will be much easier." Luna said. Twilight was reluctant, but she didn't feel like she had much of a choice. She fumbled her way out of her clothing, receiving a bit of help from Luna.
Luna let her eyes roam over Twilight's body. She looked so hot there in her bra and panties. It was hard not to play with her. But it was too early. For now she would let Twilight play with herself.
Twilight shakily got out of her bra and panties and then sat back down. She began to furiously masturbate as Luna posed erotically for her.
Twilight returned to class flushed and happy looking. Sunset and Rarity both took note. They couldn't allow this to stand.
The tug of war for Twilight was about to begin in earnest.