New World, New Jail, Same Goal 2

Sukuna's long shot plan was to study this new world and find the perfect timing to permanently cause Ritsuka to be unable to control his body, then whatever else after that.

It was easier because his notoriety might not exist if this new world is really that different, but if it did?

Well, he'd pat himself in the back, suffering from success and all that.

So, right now, the binding vow has been made and he'd have to first analyze the situation before Ritsuka gives the go, his head was pierced through so first up was Reversed Cursed Technique (RCT), then he'd have to take care of those two servants, they seemed like spirits so it should be fairly easy.

Then, afterwards... he'd have to use whatever time he had to test how Cursed Energy in general reacts to mana, and if there was extra time, see what else he can do to those spirits.

He saw Ritsuka taking a deep breathe and readied himself.

"GIVE!"

F/TJ

Olga who was still reeling from the death of Ritsuka could not process her subsequent time for death properly and Mash was in despair, preparing herself to disappear into motes of light.

 However, none of those happened.

The very next moment, Mash felt an even denser, more powerful mana pump her. But, at the same time, her guts, or maybe the guts of whoever servant was mixed with her saint graph, warned her.

That whatever was in the place of her Senpai... was evil.

"HAHAHAHAHAHA!" A true unhinged bellow came out of the now standing, face tattooed and alive Ritsukuna.

Olga could only stare dumbly. The 2 hostile servants assassin and rider could only look back and the mage who was watching from far away skidded to a halt.

All of them felt it.

That whatever this was... was not the same as the master from before.

Right now, Sukuna was still the same as from the fight with Gojo, in other words he was at full power.

The fight ensued immediately, assassin and rider came to flank him, so he responded by blocking the knife of assassin with a CE boosted elbow, grabbing his hands and slamming him right into rider.

The chains caught him but with no movement, it was cut apart and rider had to fall back.

"S-Senpai?"

Ritsukuna looked at Mash and categorized her as 'Ally' and promptly ignored her, the weird link-ish feeling from his right hand to her was interesting, but not worth the attention yet, he then looked towards the pompous Olga, who was near tears at the sight of his life.

'Hm? She's dead?'

'W-What do you mean Director Olga is dead?!'

'Hell if I know, I'm just observing and stating the facts, she's dead, literally no physical body exists in there, she's a straight up physical ghost, how interesting.

He placed back his attention at the two servants who started reevaluating him.

"What a droll. I don't have much time, so let's make this a quick feast."

Palm upwards, he pointed to fingers, his middle and index at the two servants.

"I know your composition, you two are a condensed structure made of his mana thing, right? It's like a container of some sort, therefore I'm guessing to treat that like you would a physical body."

The servants readied, but unfortunately... they were already dead the moment Ritsukuna came.

"Cleave."

Without much fanfare, the 2 servants found themselves decapitated, dead and turning into motes of light, this part of them to return to the throne of heroes.

Until Ritsukuna grabbed both of them.

"Hey now, what ingredient flies away when nothing has been done yet?"

Sukuna was a monster capable of Jujutsu so complex that he turned himself into an object. His control was to the point that he could do anything given time.

So, for spirits like this, touching them, let alone seeing them, was child's play.

"Now then, I'll find a way to keep you two."

First attempt, store them in the same area of the soul he was on, results? Failure. Something that was blocking his incarnation was blocking the same vice versa.

Second attempt, pump them with CE and consume them, results? He was unable to do it properly, he still needed to study the new energy more.

Third attempt, store them into... he didn't know why exactly he still had it, but the Ten Shadows shadow. Results? Successful. Or, it was after he wrapped them in cursed energy so they don't leak out, it was tiny balls of servants in his shadow and that was fine.

Now, seeing as Ritsuka still didn't bother returning, he took a moment to feel this mana inside this body, if it worked like CE, them he'd probably jump to above average in control just like that, but if it wasn't then he can spend as long as he wants inside the brat's soul.

Mash quickly hurried to Olga's side, and Ritsukuna looked to somewhere else.

"Keep your guards up, there's another of those flies. Reveal yourself rat." Sukuna warned the 2, looking to the east.

"Hoho, not bad, not bad, for whatever you are." A blue haired robed man came out of hiding.

Ritsukuna's first action was dismantle. Which was promptly dodged.

"Hey! Wait, stop! I'm not here to fight you like those guys, in fact, I was actually about to help, but it seems... you're strong enough to deal with it." The blue haired man raised his arms up in surrender, and after a bit, this was recognized as a sign of an ally until it wasn't.

'Are you serious?'

'He said he wasn't going to fight! And, he hasn't shown anything like those 2 anyways, plus you're just going to beat him if he does, right?'

Ritsukuna grinned at that. Sweet summer child, think of him as an ally as much as you want, the betrayal would taste sweeter even more at the time of reckoning. Or so Sukuna thought.

"Fine. Do whatever you want."

Ritsukuna stood, eyes closed in place.

Mash wondered what was going to happen and Olga was still gathering her mind.

It stayed like that for a minute.

"FUCKING TAKE BACK YOUR BODY ALREADY!"

'O-Oh! Sorry! RETURN!'

It was an odd feeling, like your heart was jammed into something, but painless, in moments the tattoos receded and Ritsuka felt like himself again.

His first thought was to check up on the other two.

"Mash! Olga! Are you both alright?" Ritsuka went to them, eyeing the blue haired servant a bit and then focused fully on them.

"Just minor injuries, senpai. And... Director Olga was unharmed throughout it all. But, what was that Senpai? Or, who?" Mash said, but pressing the last question more.

The blue servant came closer to that as well.

"Name's Cu Chulainn-"

"The Irish Hero? Son of Lugh, God of Light? Student of Scatchach and wielder of Gae Bolg? But... aren't you supposed to be of the Lancer class sir?" Mash interrupted, showing the nerd that she was.

"Er, yeah, I mean I don't know myself, but I guess I did know some rune magic. Honestly, I've would've lived to be summoned as a lancer myself, this container's kinda weak sometime, you know?" Cu said, sitting nearby with his stick.

"So. About that creepy thing kid, what was that?" Cu prompted Ritsuka to continue.

"W-When I died... or did I? I don't even know anymore... but I found myself face to face with him... he said it was my soul." Ritsuka started.

"But how did he get there?" Olga asked, now fully back to reality and curious herself. She has some theories but kept it for now.

"That's the thing, he said he came from that summoning we did... I don't know how, but that's what he explained." Ritsuka revealed.

"Huh? He got summoned inside you?" Olga asked incredulously.

"Is it that rare?" Ritsuka asked.

[Rather than rare, that's straight up impossible! The coordinates of the summoning is where the servant is supposed to pop out from, not inside someone and even if they were summoned inside, it'd be the literal version! You'd die on the spot from it, guts all over!] Roman, who was listening all along chimed in.

"What the hell?! I-I could've died from summoning a servant?!" Ritsuka said in shock, finally realizing how serious the whole thing was.

"No you doofus, the chaldea has long since mastered the art of summoning, we supplement it with top of the line, cutting edge technology, it's just that, this, everything has been weird recently!" Olga, who felt a bit offended at that replied hastily.

[Rather than that, if he was summoned, then he is a servant no? Did you know who he is? What's his name? Maybe, it's specifically him, his noble phantasm or something that caused it.] Roman interjected with a solid theory.

"Umm, I didn't kn-" As if remembering something, Ritsuka's face lit up.

"Ah, it was... Ryomen Sukuna! I heard it when we did that binding bow thing!"

...

"Who's that? A japanese servant?" Olga asked, specifically to the well informed nerd Mash, however she only shrugged.

[Let me check the database... he's... he's... holy shit. He's... a divine spirit from as old as 720, a mysterious god or devil depending on who was asked, he had 2 faces, 4 limbs and was more or less a walking disaster, t-that sounds like bad news] Roman informed the others.

All of them looked at Ritsuka.

"AND YOU MADE GEASS WITH THAT THING?!" Olga screamed, more worry than actual anger.

"I-I didn't know and I was desperate! I- I didn't want you all to die!" Ritsuka added his own opinion, and it seemed like Olga was about to say something but remembering what just happened her teeth audibly closed and she silently looked at the floor.

"I... I'm sorry." Olga squeaked before silently sitting back down.

[Still... what do we do, from the previous situation, it seemed like you became a pseudo-servant for him, can you tell us the details on the geass? Or vow? Whatever it was? Maybe we can do some-]

A mouth formed on Ritsuka's cheeks.

"If I were you, I wouldn't speak a word of that vow to anyone ever."

"W-WHAT THE FUCK!?"

"I didn't inform you but I added a secrecy clause at the end, or well, I am informing you know."

"WHAT THE FUCK!????"

Everyone only stared in awe as the mouth forming on Ritsuka's cheek spoke the same voice as when he was Ritsukuna.

"That's all, don't mind me, continue speaking, it would just suck if the brat died accidentally for breaking a... geass as you would put it." Sukuna added before completely disappearing.

[That... that was something. That's not how Pseudo-Servant works, that was more like... a symbiotic relationship.] Roman deduced.

Ritsuka still in shock that his cheeks grew a mouth, grabbed his hair and screamed.

He just went here for something of an easy job, then he met a cute girl, then he got chewed and then everything went to shit, a-and he died and then now he's some sort of freak that has mouths growing on him?

It was only the beginning of Ritsuka's tragedy and Sukuna's entertainment, but they both were already suffering and enjoying respectively.

After a bit, everyone settled down and they all agreed to continue on their journey.

1 servant was already dead, 2 servants were killed, and one joined them. There was 4 more left.

It wasn't the greatest of initiations, but at least they were getting somewhere.

"Where to next?" Ritsuka asked Olga.

"I don't know... hey caster, what do you know about our situation here?" She referred to the one that's been here the longest.

Cu started laughing and then stopped, then gloomly looked towards the mountains in a certain direction.

"Well, good news is that I have a quaint idea of how to end things, bad news is that we'll have to work really, really hard for it." He informed. Waiting for reactions.

"How hard?" Olga asked.

"Fight an immortal berserker with top tier stats and fight an archer that doesn't act like one and if he does, he nukes stuff, then fight a saber that is too strong that even the immortal berserker didn't win against." Cu explained.

"Oh."