Dear Princess Celestia,

Thank you so much for sending me The Correlations and Causal Effects and Affects of Harmonics on Leylines and Aetheric Manipulations. I know I was skeptical when you first mentioned it, but I'm not above admitting when I'm wrong. It has opened my eyes to a whole new line of study that I'd never considered before. I've already started with my old recorder and have managed to produce some measurable results! I was so excited yesterday that I immediately sent out for a wide array of instruments to expand my test groups. The first stage of small scale experiments is already planned out and you can expect my preliminary findings some time next week.

I was also wondering if you could extend my admiration to Princess Luna for today's nightscape? They have all been amazing since her return, of course, (Not that they weren't wonderful before! You know I've always enjoyed the night sky.) but those streams of color she added to the north are breathtakingly beautiful. I've never seen anything like them before, and I was wondering if she would be willing to talk about them and answer a few other questions that I've been contemplating. I know that you and she have enough on your plates already, but would it be possible for her to visit me in Ponyville, or for me to visit in Canterlot to discuss what she has been doing? If neither of those, then perhaps we could begin a correspondence?

Always Your Faithful Student,

Princess Twilight Sparkle

Celestia could not keep the small laugh from rumbling through her chest and her sister by association.

"Most lovers would consider it rude to be ignored in favor of scratches of ink on dried wood pulp."

"Most lovers also lack a student with a penchant for attracting disaster like a candle attracts the moth."

Surrendering the point without argument, Luna continued, "I take it something of amusement has occurred in Ponyville?"

Celestia turned her attention from the scroll above her to the sister lazily sprawled across her chest, tired but glowing in post-coital bliss. The letter had arrived at a decidedly inopportune time some minutes prior, though it could have been worse. She doubted either of them would have been able to save it had Spike sent it even ten seconds later.

"Not as of yet," Celestia said, letting her natural smile shine through, "but it appears my former student is set on amending that oversight shortly." Luna hummed with curiosity as she began to trail small kisses along her sister's chest, journeying north across the expanse of sweat soaked white fur. "She has decided to experiment on the interplay of harmonics and magic."

"Tia!" Luna scolded, raising her head sharply to stare Celestia in the eye. "How could you be so cruel? Even I have heard tell of Twilight Sparkle's calamitous endeavors to master the musical arts."

"It is an important aspect of her magical studies, as you well know! That I lacked the fortitude to foster it properly in her youth is no reason to keep it from her indefinitely... no matter how unfortunate it will undoubtedly be for Spike. Besides, it isn't like she need be the one playing. She has friends to help her now. I am certain she'll recruit one of them before too long. Still," Celestia said, pausing with a thoughtful expression, "perhaps you should make that suggestion when you go to visit her."

Luna snorted, her ears folding back. "You know I despise when you do that."

"I know nothing of the sort," Celestia retorted with a haughty sniff as she presented the letter for Luna's perusal. It was a beautiful sight, watching her sister read the letter. The way her eyes sparkled, dancing across the page, a deep blush filling her cheeks, turning them a shade of violet that almost matched Twilight's mane. "You will go, won't you?"

Despite her excitement, Luna looked away. "Are you certain that is wise? I am not nearly the liar you are."

"Such honeyed words you whisper in my ear."

Luna's hoof dug between Celestia's ribs, making her jerk. "You know my meaning."

Celestia's magic drew Luna's drew Luna into a short kiss. "Then do not lie. Tell her... tell her you found new inspiration in an old dream." Seeing another protest forming on her lover's lips, Celestia continued, "If not for yourself, then for me?"

"You aren't going to give me a choice are you?"

"Consider it another anniversary gift."

"I fail to see how this would qualify as such."

Celestia wore mischievousness like a mask. "That is because you have yet to unwrap it."

Luna carried her skepticism like a shield. "I will do this... but I reserve the right to say 'I told you so'."

"Deal." Running her feathers through Luna's mane, she continued, "But for now, we have a few more hours to celebrate, and you have not screamed my name nearly enough times."

Author's Note

The story continues in Cuori Intrecciati.