The sun rose like any other day in Royal Woods. Birds chirped as they flew along the sunny late morning sky, and the familiar sounds of chaos rang from the Loud House, along with a small explosion from the top floor.

"Do not panic!" Lisa Loud announced as she poked her head out of her room, her siblings not even paying her a glance. An explosion was pretty mundane here. "The gas is not poisonous… Just refrain from inhaling it directly."

Lincoln Loud sighed as he walked out of his room. He fastened his pants over his waist, securing the button, and gazed in front of him at nothing in particular. He wasn't sure when he started the habit of talking to nothing, but it helped him think, and sometimes, he'd playfully refer to it as 'The Audience.'

"Here in the Loud House, Saturday isn't our quietest day." The 11-year-old began his journey through the war zone, a.k.a; the upstairs hallway. He ducks past his little sister's battery-powered car, avoiding almost getting run over.

"Lincoln." A voice cut into his monologue. Lisa Loud looked up at him, holding their sleeping baby sister in her arms. Before he could ask her anything, she passed the infant to him. "I fear the gases leaking from my latest experiment might be damaging. Would you please handle our sister while I try to decontaminate the room?"

Lincoln smiled, taking the sleeping Lily in his arms and gently placing her on his shoulder. "Sure thing, just make sure you get this cleaned up before Mum and Dad get home."

"Affirmative." She replied, swiftly retreating to her room without another word.

Lincoln held his sister closer, returning to his internal thoughts. "But this Saturday has the perfect recipe for chaos. Our parents are out on vacation for the next couple of weeks. On top of that, Lori's at the mall with Bobby, leaving Leni in charge. And that means no rules. To an extent, of course. We all remember what happened last time." He shuddered at the thought. The chaos was hard to forget.

Lily began to stir in his arms, probably woken by his voice. He smiled down at her. "Hey there, Sis." Lily reached her small hands up to him, giggling loudly. Lincoln tickled her little tummy, and she yelped out and laughed. They got down to the bottom floor, and Lincoln placed her on the couch. "You're so adorable sometimes, Lily, and my favorite sister in between all this chaos." Lily giggled happily at that. "Sit tight, alright? I'll be back with a snack, and hopefully, we can watch TV. It's a rare day having the couch free like this."

He slipped into the kitchen to rifle through the cupboards, leaving the happy baby to herself. Not even three steps into the dining room, a loud cry stopped him dead. Lily wailed in the living room, but there was something different. The baby of the house crying was normal, expected even in any household, but something about this cry felt wrong.

"Lily!" All Loud children yelled simultaneously. It seems like everyone else heard it too. When he got to the living room, most of his sisters were already there, crowding around where he had left Lily.

He pushed past the small crowd of his bewildered sisters and rushed to Lily's side. Except, it wasn't his baby sister who stared up at him teary-eyed. At least not the way he remembered her.

Sitting where he had left his little one was a young girl, probably no older than Lincoln or Lynn, with platinum blond hair that cascaded around her shoulders. She whimpered lightly, rubbing her eyes as small tears streamed down her cheeks. But the most noticeable thing was that she was wearing nothing but a diaper. The diaper undeniably belonged to Lily.

The babywear clung tightly to her waist, looking like it could burst at any second. Her eyes fell on him as soon as he managed to reach the front of his crowding siblings. She let out a whine. "Lincoln." She moaned, bursting out in another cry that he could unmistakably place as his sister's and wabbling over to cling onto his chest. Her decent-sized breasts pressed onto his shirt, and he resisted the urge to push her away, blushing lightly.

Still in shock, he glanced around for help, and his sisters stared back at him, looking just as confused as he felt.

"What the heck is going on?!"

"Hmm… I see." Lisa pondered as she ran the device over Lily's body, now more modestly covered in one of Lynn's sports jerseys.

Everyone had backed away to give the two some space, and Lily sat, curiously glancing around.

"So, what's the situation, Lisa?" Luna asked anxiously, voicing the question everyone was thinking.

"Yeah, and like, where's Lily?" Leni added.

Lisa sighed, still reading the reports of the device. "Well, this is Lily. All physical readings identify at least that much. Somehow she seems to have aged up by about a decade or so, looking to be about biologically 12 to 13 years old. I will need to perform more studies, but this is clear. Now the obvious question of how this happened?" she paused off her glasses to rub a hand across her temple. Taking a deep breath, she murmured loud enough for them to hear. "I have no idea."

The siblings gasped in unison. If Lisa, of all people, couldn't explain it, then they were in some real trouble.

Lisa "But all signs point to only two possible scenarios. One is that the government has been experimenting with our water supply. And the other being-" She cut herself off and bowed her head in slight embarrassment. "This was caused by the gases emitted by my latest experimentations."

"What?!" They exclaimed louder. Panic incuded immediately, as all of them talked over each other asking questions. Luna raised her hands, trying to get them all to settle down. "Ok, everyone quiet down!" The noise slowly died down. "Is it gonna affect the rest of us Lisa?" Luna asked as she began to examine the rest of them.

"No. I assure you I properly contained the gas in my room, meaning that none of you will be affected in any way. I, also was protected by my heavy-duty gas mask." She patted the mask that lay on her head. "Unfortunately, I was not expecting the outcome of my experiment to be a gas explosion, and was unable to give Lily any such protection. Meaning she had about five minutes inside there, constantly breathing it in as she slept. It is most likely that this was the outcome of the situation even with how scientifically impossible it is."

"So, you made some kind of aging gas?" Lincoln asked, scratching his head. Everything she said sounded easy enough to understand, but the very concept of something so impossible felt strange to think about.

Lisa sighed loudly, her face pointed in her usual glare. "If that is the way to put it, so even the greatest of all simpletons would understand me, then yes, I made an aging gas."

"What exactly were you making this time anyway?"

Lisa blushed. "I… I am not fully comfortable answering that question."

"Well, what are we gonna do?" Luna asked as all eyes fell on Lily.

She noticed them staring and giggling. "I don't mind being like this."

The others gasped, having not heard her speak until now. She suddenly lunged off the couch onto Lincoln. "As long as I'm with my Linky!"

"Wha… What?!"

The door opened and Lori walked in, holding at least a dozen shopping bags with her phone pressed to her ear with her shoulder. "I know right, and those boots…" She paused, noticing the scene. "… I'll call you back."

Author's Note: Ahh, my first M-rated fanfic. It took a while (and a lot of nose bleeds) but I finally summoned enough courage to post one. It's not a surprise to me that I decided to post in this category. Anyway, you know the drill. You must have read the fic by now if you're down here, so why not do me a favor and scroll down to that special box over there and leave me a review?

Peace!