"Twilight you have to concentrate." Celestia said.
Magic was the hardest thing Twilight ever had to do. She needed to be perfectly focused on what she wanted to do, needed to shape her emotions so that she could achieve the desired result. All while Celestia was very close by, giving her tips and pointers in a whispery voice.
She managed to form a ball of magical energy in her hand and let it disperse.
"See, that was very good Twilight." Celestia said.
"Th-Thank you, Principal Celestia." Twilight said.
"I told you, you can just call me Celestia. No need for titles." She said. Celestia was looming over Twilight, who was sitting in her chair stiff and tense.
"You've been doing very well. But something is slowing you down." Celestia said, stroking her hair. They had been at this for a month and Twilight indeed had been making slow progress. She could recite any spell and it's description Celestia taught her with ease, but actually shaping mana into a spell was still quite difficult for her.
"I-It's just difficult to keep focused. To shape the spell with my intent." Twilight said.
"I think I know what's wrong, Twilight dear." Celestia said.
"W-what's th-that." Twilight said.
"You are trying to keep your emotions all bound up. Yes, you should shape a spell with intent, but you have to let your feelings flow through you. Yes, it helps to have some anger in you when casting a combat spell, or compassion when you are casting a healing spell, but you can't be focused on twisting your emotions when you're trying to cast a spell." Celestia said.
"So...it's alright...to feel whatever?" Twilight said. Quite honestly she felt horny. Celestia was so close to her, in tight-fitting clothing that showed off her curves well. She giggled a bit. It was a musical sound.
"Of course my dear student. Now then, what are you feeling right now?" Celestia said.
"R-Right now?" Twilight asked. Right now Celestia was in her personal space, stroking her hair and whispering in her ear. She was fucking aroused, what else could she be?
"Yes, right now. Don't worry Twilight, you can tell me anything." Celestia said.
"I-I..." Twilight said.
"Please go on." Celestia said.
"I-I-I..." Twilight said. Again Celestia laughed.
"You are so cute when your flustered you know? Very well then. Since you can't get the words out, I'll help you along. Right now I'd say your feeling very aroused, aren't you?" Celestia said. Twilight's mouth opened and closed several times before she was able to fully process what she had said. Then she just managed to squeak, "How did you know?"
"Oh, Twilight. I know how you look at me. Did you really think your dear teacher could confuse your feelings towards me for anything else?" Celestia said. Twilight felt foolish. How could she have thought that Celestia wouldn't see through her immediately? Celestia was wise and brilliant. She knew all and could see all in her own school. The very notion that she could hide the lust she felt towards her principal now seemed absurd to her.
"I-I'm so sorry." Twilight said.
"There is nothing to be sorry for. It is perfectly natural. You surely knew that." Celestia said.
"I-I shouldn't have been...staring. I'm so sorry. That was so rude and-" Twilight said, spiraling.
"That's nothing to be ashamed of either. I quite like it when you look at me that way. It is quite flattering. And it would be hypocritical for me to punish you for a sin I quite enjoy as well." Celestia said.
"S-Sin?" Twilight repeated.
"Yes. Lust. I have had quite my share of lovers. Male and female. In truth, Lust is the source of my magical power." Celestia said.
"Lust is the source of..." Twilight said.
"Yes, my dear Twilight. In order to really succeed with magic, you have to embrace a power source. Namely, a sin." Celestia said.
"I very much think that your sin is Lust as well." Celestia said. She got up and walked a bit away. Behind her desk this time.
"You need to lean into that Lust of yours Twilight. Embrace it. Foster it. Only then will you become a truly powerful magic user." Celestia said, unbuttoning her blouse and exposing her perfect breasts contained within a lovely bra that Twilight would very much have wanted to peel off.
With just a minor amount of effort, Twilight was able to materialize the same orb as she had before. However, this one was a bit bigger and filled with more magical energy.
"There you go Twilight. By embracing your lust you are able to work magic much easier. Keep it up and you will become a truly extraordinary magical talent." Celestia said. Sitting behind her desk and buttoning up her blouse.
"That's all for today Twilight. But keep practicing. I shall see you tomorrow." Celestia said. Twilight stood and stared for a moment, then bolted out of the room.
Celestia had put her opponent in Check. She really didn't think there was much of a recovery they could make. But it might be amusing to see them try.