Author's Note: After re-reading this, I realized that Moon stated she learned to dip down at 19. That might mean that she was a 'late-bloomer' in terms of mewberty. In my personal timeline, Moon married River around her 18th birthday. Given this information, I've updated this chapter to reflect what the show has given us.

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Moon's Mewberty

It was just another ordinary day for Moon. She ate breakfast with her adoring husband, listened to his corny jokes, and prepared for upcoming activities. However, due to her mother's passing, Moon was never told about Mewberty, one of the most drastic moment in a Mewman teens life. Had Moon known, she would have taken several precautions once she began to near the average age and wait for it to appear. Instead, she ignorantly started her day as usual.

After breakfast, Moon left to speak with the Ambassador of the Waterfolk Kingdom about the garbage beaches. After that, she responded to a long list of letters from the Pigeon Kingdom concerning finances. Then, she ate lunch with River who had spent the morning with King Ponyhead. It was at lunch that the first sign appeared. Moon failed to notice it, as did River who was re-enacting his morning tussle with the flying unicorn head.

By mid-noon, the servants noticed but Moon, buried in her work, did not. The servants incorrectly assumed Moon knew what mewberty was and failed to point it to her. Having finished all her paperwork, Moon retired to her room before supper. It wasn't until now, that Glossaryck finally pointed it out to the tired queen.

"Uh, Queen Moon, you are aware that you're currently going through Mewberty, right?" He cringed as more purple marks appeared on the young woman's body. Moon was currently flipping through a book she had pulled from the library.

"What do you mean, Glossaryck?" She looked up at floating blue man, hoping he would give her an actual answer.

"Well…you'll find out soon enough. Uh, try to stay within the castle until…5:00 p.m., okay?" Moon frowned, that wasn't much of an answer.

Moon heard a knock at her door, so she left her bed to see who it was. Her husband stood in the doorway with a bouquet of flowers and parcel of sweets. He smiled deviously as he held out the gifts for her to grab. Suddenly, Moon and River saw multiple purple hearts spread down her arm and onto their locked hands. Shocked, the queen pulled her hand back, but it was firmly glued to River's.

"Uh, Glossaryck, what's going on?" She continued to tug on her hand but ended up knocking herself down with River, who fell on top of her. As a result, a swarm of purple hearts covered the two and the surrounding floor. River cried out in alarm and tried to disconnect his hand, but it refused to budge. Finally, with a strong tug, his hand separated from his wife's and he stumbled backwards.

"Little blue guy, you need to help Moon!" River tried to get Glossaryck out of the book, not knowing that he was watching from the bed with an amused look on his face.

"Sorry, there's nothing I can do for her. Just let it happen and then the two of you can continue whatever it is you were about to do." The book and Glossaryck moved away to avoid being swallowed up by the purple hearts.

"Dear, are you alright?" He stared at the mass of purple where Moon lay.

"…Boy…"

"What?" A purple hand reached out and poked River in the chest. He heard a chilling giggle before the hand disappeared once more. River slowly backed out of the room, careful not to catch the attention of his changing wife. River closed the door and waited outside for Moon to say it was all a big joke, but she never did.

The door opened, and a long purple hand shot out, grabbing a nearby hall boy, and pulled him into the room. A short yell of terror was heard before it was quiet once more. River refused to go near the door. A young musician walked by and was also dragged into the queen's room. Finally, a giant butterfly-like creature exited the room, it's eyes glowing brightly. River didn't stare long enough to notice it was his young wife, he simply ran as fast as he could.

The creature flew after him, flying at horrifyingly rapid speeds. River made it outside, but so did Moon. Just as she was about to fuse him to the tree he was cowering next to, the purple hearts began to flake off, revealing an exhausted Moon. She collapsed on the ground before inhaling deeply.

"Moon! Are you alright?" He ran to her and helped her up.

"Yeah, I…don't know what that was." She looked confused and a little frightened. "Are you alright?"

"Haha, well-", River stopped talking when he heard flapping. Moon panicked and moved her hair aside. Moon had grown a small pair of transparent blue wings that flapped wildly.

"Interesting. Are they strong enough for me to fly?" Moon flapped her wings furiously but didn't leave the ground. "Oh well, I'm hungry. What about you River?" He lightly touched her wings, causing his wife to shiver. "That tickles," she said with a giggle.

"I'm hungry too. Did you…like my gift?" River offered his arm which Moon graciously accepted.

"Of course! We'll save that for dessert," she said mischievously as she pulled him along. River laughed and carried her back to the castle, too impatient to walk.