"Well, this has got to be better than being adult me," Gilgamesh Lily said as he examined the upturned cart of potion of youth.
Then he looked down at himself, at his black and white casual suit.
"I think my style could be better," he said before he opened up the Gate of Babylon and stuck his head in to rummage for better clothes. "Now where is my wardrobe? And how badly did older me mess it up this time?"
* * *
"Huh," Servant Archer Lily, otherwise known as a high school student Shirou Emiya, said as he looked down at his body. "Never figured I would be on this side of the Grail War."
"Archer!" Rin, his Master, demanded across their Master-Servant link. "What happened! I felt something happen to you!"
"Well, funny you should mention that," Archer Lily said across the same link. "I think I just sniped an enemy Servant only to get caught in the oddest counterattack ever."
Silence.
"Who are you?" Rin's voice, cold in suspicion, demanded of her Servant. "And what happened to my Servant!?"
"It's me, Archer," Archer Lily replied. He couldn't go by Shirou. He just saw his alternate self earlier today in school. "You may want to be sitting for this because I don't think you'll believe what I'm going to tell you."
* * *
Saber Lily blinked at the golden sword in her hand and the white dress and armor she was wearing.
"Merlin!" she yelled.
"Wait," she tilted her head cutely. "Why am I screaming out 'Merlin'?"
Then she pounded her free hand onto the back of her other hand in realization.
"Oh yeah. Because he is always the one responsible for anything weird like this," she remembered.
* * *
"Oi," Lancer Lily, the form of Cu Chulainn who had just finished training with Scathach, demanded. "Are we gonna finish our spar or not? My evil Master set limits on how much I can fight so I wanta fight as much as I can."
"Oh. Oh, sorry!" Saber Lily apologized as she finished her reminiscence on how much trouble Merlin had gotten her into. "I guess I got carried away with this development and forgot all about it."
"It's cool," Lancer Lily winked at the girl, who blushed. "This is sorta a surprise to us both, but I really want to have a good fight before I need ta retreat."
"Oh, yes," Saber Lily said as she got her blush under control. "My name is Ar- Wait! I'm supposed to keep that secret. Um, I am Saber Lily! And you are?"
"Lancer, Lancer Lily now," Lancer Lily said as he got into position to charge. "I look forward ta a good match."
"Lancer," Lancer's newer master ordered across the Master Servant bond. "Retreat."
"Ya can't be serious!" Lancer protested as he started to stand up. "I just got a good fight and you're bringing me back already!"
"Lancer, I will use a Command Seal if I have to," Kirei ordered across the bond.
"Fine, fine, stingy loser who wouldn't know a good brawl if it bit him on the arse," Lancer Lily grumbled as he turned around. "Catch ya later, Saber!"
"Ah, you too!" Saber Lily waved her now visible sword in a goodbye towards Lancer Lily. "Good-bye!"
But as Lancer bounded away, he could hear the girlish squeal as Saber Lily got a good look at her new Master.
"He's so cute! Wait, please forget I said that! Ooh, this is so embarrassing!"
Lancer Lily barked out a laugh.
Sounded like Saber would be fun to be around for this Grail War.
* * *
"Caster?" a serious adult male voice called out into the cold. "I was under the impression that this would be over by this hour. Was that incorrect?"
Kuzuki Souichirou stepped out into the courtyard and paused as he noticed that there was no woman in a dark cloak out here.
Instead there was a teenage girl, in a light and medium blue gossamer dress and a staff in her hand.
"Oh, Master!" she cried out, getting up and rushing towards him. "I'm sorry, but I think I swallowed a potion of youth!"
She suddenly stopped and tilted her head. "But that is really odd because potions of youth are really, really rare. Why would one be out here and flying through the air like that?"
"I do not understand this magus business," Kuzuki reminded the girl, who looked like a younger version of his lover. She looked much younger, like she hadn't finished puberty. "But what is the effects of this and is it reversible?"
"Um," the teenager tilted her head into a thinking pose.
Cute, was Kuzuki's first impression.
"I don't think sooo? It might be possible to grow back to my original age, but not in a timeframe of a Grail War." Caster Lily said tentatively before clapping her hands together. "Oh, and the effects are that I am a younger version of myself, with weaker skills, I can't really do offensive magecraft, but I'm still really, really good at healing magecraft. And my Noble Phantasm is Pain Breaker instead of Rule Breaker. It's really, really good at healing and can heal everything but death!"
"Oh," Caster suddenly gasped, covering her mouth as she realized something. "And I have to break up with you, Master."
The girl bowed.
"I'm sorry, and I think you are a really great man, but I am in love with Jason so I can't return your feelings," she said formally.
"Alright," Kuzuki nodded as he appeared to calmly accept their break-up. "It is illegal for a teacher to be in a romantic relationship with a child."
"But don't worry, Master!" Caster popped up brightly. "I'm going to use my new skill, Romance of the Sea Foam, to find you a good romance!"
Kuzuki blinked.
This wasn't what he was expecting…
"Let's see, to do that, I need to examine your relationships with the women you interact with regularly," Caster Lily mused as she started to walk around, thinking about how she was going to find her favorite Master a good woman. "Ah, I need to meet your fellow teachers!"
She wheeled around on her Master, pleading with adorable puppy dog eyes. "Can I go to school, pleeeaaase?"
* * *
The former Assassin looked down at himself as he realized he was a lot younger.
"Hmm," he mused before shrugging. "Guess I should practice my swallow cutting technique some more."
So the second Saber Lily drew his sword and started swinging, practicing how to swing a sword so that a swallow could not escape.
He was going to follow his teacher's teachings. He was going to become a swordsman.
And he was going to figure out how to cut down a swallow mid-flight!
* * *
Berserker was no longer big.
Well, that is wrong. He was still big, but he was no longer a giant.
Instead he was a young man, a big and huge man.
And he is not a Berserker anymore, having been taken back to an age before his berserk rampage that caused him to undergo his Twelve Labors.
Instead, he was now a Rider. With 12 Noble Phantasms, each one relating to one of the 12 Labors.
"Wow," Illya said, as she looked over Rider Heracles's stats. "12 Noble Phantasms. The Nemean Lion, Lernaean Hydra, the Golden Hind, Erymanthian Boar, the Augean Stables, the Stymphalian Birds, the Cretan Bull, the Mares of Diomedes, the Girdle of Hippolyta, Geryon's cattle, the Golden Apples of the Hesperides, and the Cerebus of Hades."
She looked up at Heracles who smugly smiled.
"And you can summon all of them!" she squealed. "Which one should we use first? I want to see the cerebus!"
"All right, little Master," Heracles Lily chuckled as he flexed his muscles under his Master's admiring gaze before extending his palm down to the level of her knees. "But I don't think this street is big enough for it. Climb up and I'll take you to a place where you can see it."
"All right!" Illya cheered as she jumped onto the hand which brought her up to his shoulder, where climbed on, settling in for Berserker travel. "Let's go!"
"As you wish, little Master," Rider Lily chuckled before using his A level agility to run off towards the forest.
Within a minute, the duo was safely hidden among the trees.
"Cerebus, Cerebus, Cerebus," Illya was cheering enthusiastically on the tree branch that Heracles had dropped her onto.
"And here you go!" Heracles roared "The Twelfth Labor, Capturing the Cerebus!"
Illya cheered again as a massive, black furred, three-headed dog appeared in the clearing before her.
And then screamed as it lunged at Heracles, all three heads snarling.
"A feisty fellow isn't he!" Heracles yelled as he started to wrestle the giant dog. "Give me an hour and I'll have him under control!"
"What!" Illya yelled as she started to read the details for Heracles's new Noble Phantasms.
"Oh," she said as she read the fine print. "That… actually makes sense."
Heracles Lily has yet to undergo the 12 Labors. The task to accomplish each labor must be accomplished before the Noble Phantasm will obey the Servant or before Heracles Lily will be able to use the product of such a battle. Each of the 12 Labors can be carried out in the modern day but requires the approval of the Master before each can be started. The Master takes on the role of Eurystheus but can only choose the 12 Labors as worthy feats for Heracles Lily.
"So he has doing 12 Labors as his Noble Phantasm," Illya sighed before brightening up. "Then that means that I can watch him do each! And he has to bring the rewards to me! Go Berserker! I mean, go Rider!"
"Thank you Master!" Heracles yelled as he punched one head of the dog into a nearby tree, causing the old and wide tree to topple over.
"Too bad, he lost Godhand," Illya commented as she swung her legs while sitting on the tree branch, watching the fight unfold in front of her.
* * *
The former Rider Servant petrified Shinji with her eyes as he had started screaming at her younger form and was annoying her.
"As my older sisters would say, 'Who let the howler monkey in? Go chase it away!'" Medusa Lily said whirling her scythe.
Medusa Lily, like Heracles, had also experienced a class change. Into Lancer.
And she was now a young girl, the same apparent age, weight and size as her older sisters.
"At least I am cute now," the young goddess said as she twisted and turned, examining herself next to the stone statue of her annoying former temporary Master. "I would hate to still be ugly like my older self."
The girl finished her examination of her armored dress and nodded.
"Alright, time to return to my Master," the girl decided, vanishing Harpe and jumping off into the night sky, following the trail of her mana source back to Sakura Matou.
The remnants of the Book of False Attendants laid petrified in the now stone Shinji's pocket. The book had been binding on Rider Medusa, but not Lancer Medusa Lily.