Breakfast for Luna was, in her mind, a major event. It was the only time she really got to speak with her elder sister, and today, unbeknownst to her, Celestia had a surprise for her, “So, sister, how was the night?”

“It was the same as usual. I held court, and there were a few ponies asking me for favours, and to bring me mystical devices.”, this was the extent of most of her court sittings, “So, after playing a game of hide-and-seek with the guards, which I won, then, seeing as they were still out looking for me, I decided for a fly.”

Celestia just sat there, listening, “And, anything else?”, she replied, cocking her head, slightly, to one side.

“We do not understand. sister!”, Luna replied, a bit testily. Unsure what her elder sister was actually getting it.

The elder alicorn just took the change in speech in her stride, “I mean nothing hurtful in the comment, Luna. All I was asking, was there, anything unusual?”

“Very well.”, she sighed, “There was an unusual shimmer in the magic around Ponyville, is that what you are, getting at?”

“Yes.”, was all Celestia replied.

“I’m sure that there is something more that you are inquiring about?”, Luna countered, “The shimmer, perhaps? It felt, how can one put it?”, pacing the breakfast room, “It felt like somepony was bringing forth a great amount of arcane substance and force.”

The Sun Princess looked up at the last part of the statement, “Arcane substance and force? And you did nothing to investigate?”, her eyes glowing, “You just put it down to a shimmer?”

Luna shrank back a bit at this outburst, “Sister! Your own student resides in Ponyville, and I was not in the least concerned. I am certain that if she had any connection, then it was under YOUR guidance.”, she spat back the last part.

“Very well. Yes, Twilight Sparkle was the epicenter of the, so called, shimmer, but it was not of my guidance.”, came her torte reply, “In fact, she had completed a very powerful spell, one that even I was unaware that she had come into possession of. If I had known, I would have stopped her, even if it meant a restraining spell.”

“What spell did she perform?”, came the reply.

“It was one of the banned spells from Starswirl. One I had to hide, even from you, this was before you fell under the power of Nightmare Moon.”, she regretted the last part, when she saw her sister flinch, “If Sombra had known of the existence of the spell, he would have used it in ways unimaginable.”

“What spell?”, Luna said, with a hint of annoyance in her voice.

Sighing, Celestia had to tell her, “It was Starswirl’s spell to create life. One he created before he started down the left-hoof path.”, she looked saddened at the last part. Luna strode over to her sister, and placed a foreleg around her withers.

“Sister, I know the feelings you had for him. But, it still does not answer the question of how your star pupil got her hooves on a banned spell! How could this have happened?”, Luna cried out, “She not only managed that, but completed it, and I am guessing here, successfully, and you have yet to do anything about it?”

“She invited me to the library to speak about something of importance. When I arrived, she was, how can I phrase this? Forlorn. She had the result of the spell there with her.”

“And the result was what, exactly?”, Luna replied.

“A foal. She created of all things, a foal.”, Celestia said, with a slight smile, “Of all the things that could have been the outcome of the spell, that is the result.”

“Very well, but you still did not answer my question.”, she replied, annoyed, “How have you punished her?”

“I, well, I…”, Celestia was at a loss for words, “Oh, sister! I could not punish her! Yes, she managed to complete a powerful spell, one that, yes, is banned and was hidden. She showed determination to find that, in fact, I am surprised that she even knew of the existence of the spell, but all that aside, she created a foal. The reason, well, I am still in the dark, as it were.”

Luna sat down, and nodded to her sister to continue, “For her to accomplish something like that, she must have been desperate. I sense, that the need to care for somepony, outweighed the facts of the spell.”, she paused.

“Well, if you will not punish her, I will!”, Luna retorted, and seeing the hurt in her sister’s eyes, “Though, it will not be drastic, I will ensure that she knows the harm it could have caused all of Equestria.”

“You shall not harm her in any way! She knows full well what could have happened.”, came Celestias’ reply to her sister, “I have ensured that she has to bring the foal up in the highest standards of Equestrian society, and that she shall be banished if she fails in this undertaking. I am sorry if this does not seem harsh enough, but, it was my decision, if you wish to impose anymore conditions, you are fully within your rights.”

“Very well, I shall.”, Luna said, with a slight smile, “I will visit her tonight. Do not worry, I will not harm her, neither shall I harm the foal. I will find the reason, as you have not. So, let us finish our breakfast, and speak of other things…”

The morning meal passed with more, pleasant things spoken of...

Author's Note

Seeing as there was no major punishment that Celestia had placed upon Twilight, in respect of her completing the spell, Luna has decided to place her own punishment upon the student of Celestia.
She has promised not to harm either Twilight, or Eventide. And, Luna, being the Princess of The Night, will not go back on her word.