Story Start

"Sensei."

"Yes, my lovely little student?"

"Do you wanna explain to me what the fuck happened here?"

"... no?"

"Goddammit Azazel-sensei, I left for five minutes and I came back to a room filled with a bunch of toddlers, who very conveniently look like the ORC, making a mess of the clubroom."

True to his words, the previously neat and organized clubroom had been turned into what looked like a war zone taken straight out of a history book. A red-haired girl could be seen standing on top of the desk that was situated in the middle of the room with what looked like a makeshift flag and smug grin, while a dark-haired girl stared up at her with an awe-struck expression. Moving to the sitting area, you could see a small white-haired cat girl viciously scratching the sofas and hissing loudly towards a scared blonde-haired girl who was sitting on top of said sofas with some candy in her lap. To the right of the sitting area, you could see an orange-haired girl with pigtails staring in wonder at the pure white wings that were adorned on her back and a small vampire cowering inside a box near the corner. Coincidentally they were also the least involved in the mess that was the clubroom. Now to the left of the sitting area, the area with the most damage, a blonde-haired kid was excited fighting an equally excited mostly-blue-haired girl with swords bigger than their actual bodies.

They were also all in extremely oversized clothes.

"Well technically Issei, you were gone for 7 minutes." Azazel stated in a matter of fact way, not so subtly trying to diverge the conversation.

The newly named Issei felt his eyebrow start to twitch, but he quickly composed himself, taking a big breath to calm his nerves.

"Explain. Now."

Sighing in defeat, Azazel began to explain, from the beginning, what had transpired in the last 10 or so minutes since he had gotten here.

Flashback Start

5 minutes before Issei went to use the bathroom

"... and that should sum up our weekly reports, does anyone have anything to add?" Rias asked, sitting on her desk with Akeno standing beside her with a tray under her arms.

Before anyone could respond a black blur was seen flying through the window and into the clubroom.

"Yo"

"""Sensei?"""

"Mhm, so what's up my lovely little students, was I interrupting anything important?" Azazel asked, leaning against the door with a laidback expression.

"Not really, no. Anything in particular you needed Azazel, or are you just here to annoy us again," asked Rias with an obviously fake smile and a slightly twitching left eyebrow. Azazel's appearance had made her more than a little peeved. Like come on! She was in the middle of spending quality time with her sweet little kouhais and lovely peerage.

"I came to cash in on our deal, we finally finished developing our newest technology." Azazel's voice had suddenly become slightly more serious and his body had straightened up a bit as well.

Rias stared at him with evident confusion, as her brows had begun to furrow. However the confusion didn't last long, as her eyes suddenly widened significantly and she began to rummage through some papers on her desk.

"Um Buchou, what's Sensei talking about?" Issei voiced the question that was in everyone's mind with a curious and confused tone.

He also had a slightly frustrated face and his legs were closed tighter than usual, not that anyone really noticed, as they were too focused on what Rias was doing on her desk.

Rias' face suddenly lit up as she picked up what she was looking for, nodding to herself, then turning towards the clubroom and answering his question.

"Well recently me and Azazel here," she pointed at the aforementioned fallen, "made a contract where we would exchange favors. I asked him for a training session with all of us and personalized training regimens for each of you." The club members all looked at her in awe, seeing how much their Buchou cared for them, "He, on the other hand, asked me to allow him to test one of the Grigori's newest inventions on us when it was finally finished. Seems like he came to cash out on the favor right now." She finished, signaling for the 12 winged fallen to come closer.

Azazel came up to her desk and put his hand near the paper in front of Rias, pricking his finger with a needle. He allowed the blood from his hand to drip onto the paper, resulting in a magic circle to appear on top of it. After a few seconds Azazel nodded towards Rias, seeing as the magic circle had disappeared, and took a tissue off her desk to wipe the blood on his hands. Afterwards he put his hand in his pocket and pulled out a small contraption, smiling as he started to fidget with it.

While most everyone was eyeing the gadget in Azazel's hand warily, Issei was too busy to realize what had just transpired, as he was trying his best not to shit himself.

He knew he shouldn't have eaten at Taco Bell for lunch.

Before anything further could be done Issei ran out the door loudly exclaiming he had to use the bathroom, leaving a bewildered clubroom in his wake.

"...Well that was definitely something, anyways back to what I was talking about " Azazel said, breaking everyone out of their Issei induced stupor. Once everyone's eyes were back on him, Azazel continued.

"Okay, so this is a newly developed invention made by our top researches in Grigori," Azazel showcased what looked like a small raygun with a screen attached to the back, "We were looking for ways to make the average person look younger than they actually are, honestly we were developing it to sell as a beauty product, however halfway through we realized it was perfect for spy related missions as well, and began working on it around the clock." His voice had gotten increasingly more excited as he went on. "Ahem well anyways, I wanted to use it on you guys to see how effective it really is, we already used it on a few animals and monsters so you're not our first guinea pigs. It definitely seemed effective, all that was left was human tests to see if it has any negative, or maybe even positive side effects." Azazel's eyes had a slight glint of madness as he finished.

Everyone stared at him with an even more wary look.

"Don't worry, nothing dangerous should happen. Probably." Azazel mumbled the last part but everyone had heard it loud and clear with their enhanced devil (and angel) hearing

Evidently his statement did nothing to quell their fears, if anything it had seemingly increased their doubt.

Releasing a deep, defeated sigh, Rias began to speak.

"Fine, just get this over with so we can get on with our day, we have contracts to fulfill."

"I love your enthusiasm Rias! Okay everyone, group up in the center of the room so I can get this over with quickly!"

Doing as he said everyone stood in a group and began nervously looking at each other as the charismatic fallen adjusted the gadget.

"Ok, there. It should make you all look 14-15 years younger, let me know if it hurts." Not letting them say or do anything, he pressed the trigger on the gun allowing a concentrated beam of light to encompass the group.

The room was covered with a bright blue aura as Azazel watched the devils. and angel, with a focused stare, only closing his eyes when the blue aura all but flash banged him. Opening his eyes, Azazel was met with a bunch of toddlers dressed in oversized outfits staring up at him.

He couldn't stop the small snicker that had slipped out his mouth, which slowly turned into full blown, and deranged, laughter.

The toddlers could only stare in curiosity and a hint of bewilderment as they watched the only then adult in the room laugh like a deranged maniac. Of course that only lasted for a moment as the toddlers decided to look for something fun to do and began running around the room.

Azazel slowly stopped laughing with a few stray chuckles appearing every few seconds. Sighing in amusement, he finally noticed what was happening in the room.

The amusement didn't last much longer.

Azazel started panicking when he noticed the clubroom being turned upside down by the overly strong and energetic toddlers.

'Fuck shit bitch goddammit, it seems like they don't remeber anything. I wasn't expecting the deage-ninator to actually deage people. Fuck, I need to reverse this before anyone finds out or anything goes wrong'

Looking down to his hands, he found his brand new gadget smoking and glitching.

This was not good.

He quickly chucked the gadget out the window, watching as it exploded mid air, and began to assess the mess he had gotten himself into.

He felt nervous sweat run down his cheek as he finished up his assessment.

Around the room it seemed that some of the kids realized how to activate their powers, probably instinctively due to their training as teens, Durandal and the Holy Demonic Sword could be seen being swung around like cheap toys, the owners giggling to each other, Irina was seen trying to fly, crashing into the roof as she did. Gasper had already shoved himself into his box.

Moving to the other people in the room. Rias and Akeno were using pencils and papers, they seemed important but what did the fallen know, to make flags. Koneko and Asia were on the sofa fighting over a bag of candy while Asia had begun to cry and Koneka had begun to hiss.

"I'm so fucked."

As soon as he finished his sentence the door opened to a certain brown-haired dragon's face of utter relief.

The relief did not last long.

Flashback End

"... and now we're here, watching a bunch of previously young adults completely ruin their previous clubroom in their current toddler forms."

"..."

"I know, I really fucked up."

Issei sighed in defeat, starting to feel extremely tired.

"How long before you can fix them?"

Azazel got into a contemplating stance, rubbing his chin.

Issei did not like the implication of his sensei's stance.

"Well seeing as the original gadget took about 4 years to make, and the fact that we have to completely reverse engineer the original designs to make them older, I'd say about a few months at the minimum." Azazel began to sweat harder with every word he said.

Sirzechs would not be pleased.

"And until then?" Issei questioned in a weak tone .

"You and Rossweisse will have to babysit them, of course!" Azazel exclaimed as he disappeared through the window before the situation got any worse.

"FUCK YOUUUUUU!" Issei screamed out the window towards a smug looking Azazel as he flew away at top speeds.

Sighing in resignation, Issei turned around to the children, seeing the chaotic energy being almost nonexistent at that point, since the children had been all but knocked out due to exhaustion.

Issei went over to the drowsy Rias and picked her up from the desk before she could fall. She almost instantly fell asleep in the comfort of his arms.

"I really hope Azazel- sensei knows what he's doing." Issei muttered under his breath as he began to pick up the children one by one and lay them down on the sofas. After finishing up with that he began to clean up the room and plan out his next course of action.

Of course that was also when Rossweisse conveniently stumbled into the clubroom, looking as if she hadn't slept for days. Issei raised his eyebrow at her state.

"What happened to you?" He asked in a slightly worried tone.

"I was up all night grading tests and up all morning teaching classes. More importantly though, what the hell happened here while I was at the meeting." She said, eyeing the children, or more accurately toddlers, who were now soundly sleeping on the couches.

"Grab a chair, it's a long story," Issei all but groaned, looking more tired than Rossweisse herself.

The resulting explanation did not help Roseweisse's current mood at all.

Chapter End

A/N

Hi! Welcome to my first ever Highschool DxD fic. Hope you enjoyed reading it as much as I did writing it. This idea of Issei being a babysitter to a deaged version of his friends popped into my mind while I was taking a shower and I just had to write it down. So far I haven't really come up with any sort of plot for the story, it's really only meant to be a wholesome slightly-crack fic to lighten up the mood in this fandom.

God knows we need it with all the edgy fics I've seen here.

Anyways, as you may have noticed at the beginning of my A/N, I specified this as my first DxD fic, not my first fic in general, as I have written for the Re:Zero fandom before. I do hope you check them out while you're here.

Thanks again for the read, make sure to leave your thoughts, comments, questions, etc. in the reviews, it really helps with my motivation to write.

Have a nice day/night, bye!