Life in 'Pekopon-yville'

"Kululu."

The frog in question looked up from his glass of milk. "Yes, Twily?"

"Uh...I was wondering...about...children..."

Kululu started choking, and gasped "Ah-WHUH?!?!" Twilight shrieked "I'm sorry! It's my fault! Eheh..." He nodded. "You want a...foal? Or keronian...? I'm confused." She shrugged. "Well, I don't know how it works...we weren't even supposed to meet each other, remember? N-not that i regret doing so! Cause you're the greatest thing ever, and...uh..." Kululu chuckled. "Alright, I get it, silly filly." Twilight fiddled with hwer hooves. "I can only think of one way to reproduce at the moment..."

~2 hours later~

"Hi Rainbow Dash! How's Giroro?"

"Uh, good. Why is your face red, Twi?"

"Um...heh...me and Kululu are trying to..."

"Is that possible? I think you should ask the Princess about that. Later." And she took off. "...Spike...take a letter..."

Dear Princess Celestia, is it possible for a Keronian and a pony to reproduce? Me and Kululu are trying the best we can. Sincerely, Twilight Sparkle

"Wait...you mean you're-" Twilight shoved a hoof in his mouth. "You'll understand when you're older Spike..."

"Uh, Twilight, I think the Princess has-" Green flames shot out of his mouth. "...replied..."

My faithful student Twilight Sparkle, the spell contained on the last page of this book is Star Swirl the Bearded's secret unfinished masterpiece. He was never able to get it right, and thus abandoned it. I believe you are the only pony who can understand and rewrite it. As for your question, it has come to my attention it is possible to reproduce with said husband of yours, but it is no guarantee. Take this into consideration before you try anything...shall I say, rash.

Princess Celestia"

"This is great! We might be able to after all! But let me look at this spell. From one to another, another to one. A mark of one's destiny singled out alone, fulfilled. That doesn't make any sense. It doesn't even rhyme!" She threw down the book in defeat. "Well, I can investigate tomorrow. Let's get some sleep..."