Disclaimer: Refer to chapter 1.

AN: Well, sorry for the long wait but this should be a two-parter in order to help.

"Evening."

"Ev-."

"Dumbass."

Shirou Emiya dropped the now unconscious guard's body on the ground, quickly searching them for the key he would need to access what he needed, something he never told Bazett about. The less people who knew how to access his storage, the better it was for him.

'She doesn't need to know, I just need to find it quickly.' Shirou rose to his feet slowly, sighing as he yet again came up empty handed, well except for another of Rin's bracelets, something he slipped into his pocket. 'But this may help me in the end, the less pawns she has when I get it, the less trouble it is in killing her.'

Shirou continued on his way, a black cloak wrapping around his body and he seemed to blend into the shadows from it.

'But I suppose I should thank her before I do so. She was...helpful in many of my endeavors. At least before she lost her mind.'

"Give up, I've won Emiya."

"SHIROU!"

"Tai-"

"Die fool."

"NO! Please no!"

"Ohh, it seems you're willing to finally make that deal now, right?"

"You...you...I'LL KILL YOU!"

"ARGH!"

"What was that Emiya? You said you want me to kill her?"

"I promise you that I will kill you for this."

"My, my, what a Magus you've become, making such a promise. But that doesn't matter now as-"

"UGH!"

"-I want what you stole from me."

"I'll take you to it, just please leave her alone."

"Now you know I can't do that Emiya, you are hardly trustworthy. I mean, in your own words, "honor, pride, and all of that stuff is crap", you told me that yourself."

"Yes, but I'm also, in your words, "A stupid heroic fool, someone who would do anything to protect the people he loves" and the woman you want to kill is one of them."

"I guess I can trust you, at least for now."

"AHHH!"

"YOU BITCH!"

"I never said she would leave unharmed. Now bring it to me or the next one will actually take something off."

'Taiga...have you ever thought of me since that day? Have you even thought of forgiving me?' Shirou sighed as the memories of that hellish day returned, the day that had ended with him far away from Fuyuki and Rin and him separated for good, something he wished he had done sooner. Preferably with a sword through her skull or perhaps take a page out of his father's book and use a rocket launcher. 'I truly wished I had killed Rin before then, before she had a chance to fall so far...before I truly lost her to her madness.'

"What do you want Shirou?" Rin looked away from her books, finding the white haired Magus behind her and holding one of the books she had finished in his hands, idly looking through it.

"I just wanted to see how long you've been up, I've been gone for about three days and it looks like you haven't moved." Shirou stepped forward, setting the book down on a table nearby. "So Rin, how long have you've been up?"

"Five days at best Shirou, now leave me alone so I can finish my research."

Shirou stopped himself from speaking for once, his gray eyes hardening as he entered what many called his "Work Mode" as he took a slight step forward, watching Rin for any sign of noticing his movement, something she didn't.

"You haven't really been the same since we've came back from that mess we got into, do you think we should talk about it or something?" Shirou tried to keep his tone casual, looking over the multitude of books Rin had stacked around her even as he took a few steps forward, a good striking range for a sword but that wasn't what he had in mind at the moment, something longer would have been preferred but that would make it all too obvious then, what he needed above all else was to be discreet but also be certain.

"Why would we? We both came back fine." Rin had turned back to her books some time ago, deciding to ignore the worried white haired man behind her as she instead continued to focus on her research.

"You nearly died, you even thought you were going to die." Shirou picked up one of the books at the top of the stack, yet again the same topic but this one seemed more in-depth than any of the others he could see, perhaps Rin would be finished soon and move onto another field of research.

'I see...she is as obsessed as I thought.'

"I was wrong and my injuries at the time did not help." Rin closed the book, reaching out to grab a book next to her only for her hand to be grabbed by Shirou.

"We both had injuries yet before we both thought pretty clearly, I knew how to fight and you knew how to keep me from getting killed that entire time and we were both bleeding more than was healthy." Shirou pulled Rin away from the desk, ignoring her growing irritation towards him.

"What's your point Emiya?" Rin was now clearly aggravated, not bothering hiding it as she pushed Shirou away from her.

"What does it really mean to you?" Shirou didn't meet her eyes, instead his eyes were focused past her, towards the books she had yet to read.

"What?" Rin's irritation was replaced by confusion, something brought on by Shirou's lack of action after pushing him away. He was usually more persistent than this.

"What does this obsession mean to you?" Shirou asked his question again, his eyes still focused on the books behind her.

"It is far from an obsession Emiya, I am simply focusing more on the goal all Magus must have." Rin turned back to her desk, intending to continue her current research when she suddenly felt a familiar sensation from her hands.

"I see then." Shirou stepped forward, reaching behind his back and drawing out a dagger, something a friend of the couple had made as a gift, a wedding gift actually.

"What are you doing?" Rin didn't move, she didn't turn around, didn't face Shirou as a sudden anger filled her, something she didn't try to ignore. "Who do you think you are Emiya?"

"I'm a killer, I kill people who fall to far and don't want to stop." Shirou looked down at the knife in his hands, running one hand over the elegant if simple silver blade. "I'm nothing but a killer, an Executor for the Holy Church. A heretic to a lot of people, and a monster given as a gift to others."

"Shirou..." Rin collapsed, not able to stand as once again pain ripped through her, nearly causing her to scream before Shirou was there, holding her as he whispered something before she felt a warm relief fill her.

'Not today, not today when she's like this.' Shirou held Rin close, keeping her against him as she struggled to suppress screams at the agony ripping through her body every few moments. 'I...I was wrong. Please let me be wrong.'

For once, Shirou Emiya decided to ignore his instincts, he decided to ignore them nearly screaming at him to stop Rin now, a single movement and the knife would be lodged through her heart, a painless death and one he had given countless times. Instead he decided to hold Rin as agony ripped through her from the curse. The curse he should have saved her from.

'If I could rewrite the past? Would I do so? Would I have killed her then?' Shirou sighed to himself as two knives were suddenly thrown from his hands, stopping a guard from raising the alarm as he slowly walked up to them. 'No time for reminiscing I suppose, it looks like they found the bodies sooner than I thought. I knew I should have simply killed them, burning the bodies would have been easier than hiding them.'

'But, I suppose it's time to get serious. The past is the past, I need to focus on the present and my future, my hands wrapped around her throat.'

Bazett Fraga McRemitz somehow held herself back from killing the two Enforcers that had checked her out. Instead, she had simply broken most of the bones in their arms and beaten them to near death.

'He should be done by now.' Bazett grabbed her clothes from a bag nearby, glad she had decided to hide a few spares around the building before her "partner" had gotten her into the ridiculous outfit he made her wear. 'If not, I'll simply wait for him outside the building.'

Bazett calmly walked out the alley, ignoring the nearly dead Enforcers behind her as she put in a call, calling in a minor favor to get the two some medical attention before she lost credibility with the other Enforcers. With any threats to her reputation now handled, she allowed her mind to drift as she walked back towards the building, now that it was guard free she had little reason to approach it with stealth.

'I hope you're done Emiya, you aren't getting any more time after that ridiculous stunt you decided to pull.'

"Ms. Tohsaka, he's been spotted in the building!" one of her guards rushed into the room, Rin grinning as she took another sip from her glass of wine.

"Good, I can't wait to have my dear husband back." Rin set down her wine glass, glancing towards the figure across from her. "I do want to enjoy his company again."

"Ms. Tohsaka, what would you like us to do with him?" the guard remained next to her, waiting for her next orders and with good reason. The last one to leave early didn't stay whole for long.

"Kill him of course." Rin grinned as she waved her hand, sending him rushing away as she looked towards the grinning figure across from her.

"As tactful as always Rin." the man across from her chuckled as he looked at her, taking another drink of the wine glass in his hands. "I'm surprised you're even as capable as you seem right now."

"Do you ever shut up?" Rin used another minor use of Magecraft to pour herself another glass of wine, taking a small sip of it before the man yet again chuckled.

"As always Rin, you always have the perfect thing to say." the man grinned as he vanished, his wine glass dropping onto the table as she took another long sip from her wine glass.

'Just you wait you bastard, soon I'll have him back and you'll be gone.'

Shirou sighed as he sidestepped the next guard to attempt to grab him before his cane connected solidly with their skull before he pushed the dazed man away as a silver light filled their eyes before they screamed, rushing towards their partner and slamming into him. A silver dart ripped through each of their neck moments later, ending them in a puddle of blood as Shirou closed his eyes briefly, tapping into the Bounded Fields around the building and finding far too many guards remaining inside for him to search.

'There has to be an easier way to do this but how?' Shirou sighed at his lack of an idea before he spotted another patrol and quickly opened his eyes and began walking away from the dead guards. 'I need to discover it soon.'

"Stop, Emiya!" one of the guards spotted him and Shirou sighed as he turned the corner as they began running down the hall. Despite himself, he grinned at the dead end he found himself in.

'Terrific, this is quite an incredible stroke of luck.'

"Are we really going to do this?" Shirou calmly looked around him at the sight in front of him, three guards directly in front of him, himself backed into a corner in the form of the "dead end" he had walked into, and five more guards getting closer with every moment he wasted. "I don't feel like killing today but I won't avoid it, understood?"

"She wants him dead, ensure it's done." a guard spoke moments later, directing the two next to him to attack.

They didn't even get to open their Magic Circuits as suddenly Shirou was in front of them, striking one in the chest as a blade suddenly in his hands slammed into the side of another one. The third, obviously the leader, managed to throw a curse at him which a large sword appearing in front of him stopped before his fist shattered it as he struck the man in the chest, throwing him back and against the wall.

"Trace." Shirou's hands were filled with red light for a moment even as he let out a low grunt of pain. Moments later, the married black and white blades known as Kanshou and Bakuya were in his hands as the five other guards reached him.

"What does Ms. Tohsaka want us to do with him?" one of the new guards asked, his Magic Circuits already active it seemed along with the other four.

"Kill him." the leader of the first three guards shouted out as he stumbled back to his feet, dazed from his head striking the wall Shirou's blow had sent him into.

Once again, Shirou struck first, lashing out with a thrown Kanshou as he blitzed forward, Bakuya held out in front of him and cutting a curse thrown at him in half, the edge taking on a different color as the Emiya caught Kanshou as it came back around. He cut down two of the Magus attacking him with ease as the remaining three grouped together, stupidly thinking they was some type of safety in numbers.

They didn't last a moment longer that the other two, Shirou simply throwing Bakuya at them like a dart and it exploded once one held their hand out to catch it. Before the three could even recover from the blinding flash of the blast as well as the deafening shockwave, a small blade lodged in each of their necks, the force of the throw throwing them back and actually pinning them all to the wall behind. Shirou hardly spared them a glance, doing the same to the other downed guards around him before he snapped his fingers, markings on the hilt of the blades suddenly igniting with a dark red glow. The bodies were gone in a flash of fire, the heat intense enough that Shirou used Alteration on his jacket, turning it into a long trench coat with tight shirt with a half mask on his face, covering most of it below his eyes as he turned away from the heat, shielding what was exposed of his face with his arms.

"That was eventful." Shirou pulled the mask down, sighing as flames as cold as ice engulfed one hand before his cane was back in it and his clothing returned to normal as he glanced around at the now bare hallway. "Now, where was I before that interruption?"

"I think you were looking for what is rightfully mine." a heavy feeling to his head accompanied the voice, Shirou briefly holding his head with his hand as he closed his eyes, focusing on the connection he knew was there.

"Oh just great, your voice is now in my head, how...delightful."

"Many would be begging to have me as their thoughts unlike someone like you might I add."

"At least I don't enslave people."

"At least I'm not pretending to be something I'm not."

"I don't pretend Tohsaka, I'm a professional."

"Then why couldn't you kill me?"

"I was a rookie then, now I'm far from one."

"Hahaha, is that a threat Emiya?"

"No, threats are far to lax, I am making you a promise, more along the lines of fulfilling one actually."

"And what is this oh so terrifying promise?"

"My promise, as it was before, is that I will finish what I started years ago and kill you for everything you've done to ME, the hell you've put me through ever since this delusion entered your mind."

"We'll see Emiya, we'll see."

The heavy feeling he was having in his head finally abated, something he was glad for as he turned his attention to something a bit more important in his opinion, finding what he needed as it seemed one of the now dead guards did have the key he needed to get into the lower levels of the building, something they probably had no idea existed.

It was designed to his specifications after all and luckily not even Rin knew it all as he had kept the original blueprints and then burned them after the building was complete.

'Now, let's see how this works out.' Shirou pressed the key into what was "dead end" he had been "trapped" by, the key glowing for a moment before it sunk into the wall and a ripple seemed to spread across it before with a deep breath he stepped into it. Unwanted, his memories of the last time he entered the room came to him.

"Sakura, can you hear me?" a much younger Shirou Emiya stood in front of the same wall, the man somehow different, as he pressed a finger to the earpiece in his ear.

"Loud and clear." the voice of Sakura Matou came over the line, something that he was glad for.

"Good, that means the new channel works, it looks like our communications can't be blocked like you thought and perhaps we can avoid getting any unwanted company here either." Shirou sighed in relief as it seemed their gamble had played off, the channel was secure so it looked like they were safe.

"I'm glad I was right." Sakura's tone held similar relief but she was still far from comfortable with what the two were now currently doing. "Let's hope we don't have any other problems today, you're still far from a hundred percent after what happened with Rin."

"Please don't remind me about that Sakura." Shirou winced simply remembering the day they intended to enact his plan and subdue Rin so they could help her but that was quickly shot down the drain, everything had gone wrong as she had known what they intended before he had even woken up that day, probably a month in advance in truth. "That's one breakup I don't want to remember." Despite it all, Shirou managed to laugh despite the horrible "breakup" he and Rin had recently gone through.

"I just don't think this is a great idea. Rin hasn't been the same for a while now and I don't think she'll take well to this." the voice of Sakura Tohsaka reached him through the earpiece, Shirou sighing at her words before leaning against the wall next to him. "Just look at what she did to you, she nearly killed you."

"Nearly Sakura, hardly the first time I've dealt with some angry Magus." Shirou once again saw something funny about his situation, laughing yet again as Sakura sighed.

"Shirou, just be careful. Rin isn't like the usual people you fight, she knows everything about you, inside and out. She taught you everything you know about Magecraft, she knows how you work and how you act. She's your worst opponent right now so please-" Sakura couldn't finish, a laugh from Shirou interrupting her.

"She doesn't know everything Sakura." Any sign of his grin was gone, now jut a dark smirk covered his face. "I've got a bad habit of keeping secrets from people."

"Shirou, trust me, she knows." Sakura spoke as if it was a fact, something that made Shirou shake his head before speaking again.

"Sakura, don't worry about Rin, I'm somewhat sure she won't be a problem." Shirou grinned despite his words but frowned at the sigh it caused from Sakura, he had attempted to lighten the mood but ti seems like he failed.

"Shirou, please take this seriously." Sakura seemed to stress "please",attempting to get the Magus to listen to her. "Rin is dangerous and she's determined to get what she want so badly she'll do anything for it and that includes hurting the people who love her."

"Good thing I don't love that crazy woman anymore." Shirou managed a small chuckle from his words, drawing something close to a groan of frustration from Sakura.

"Shirou just promise me you won't underestimate her." Sakura's voice held desperation now, something that made Shirou grimace.

'Good job Emiya, you're worrying her again.'

"I know what's happening Sakura but whatever she is right not, it's not the Rin we know, she's been changed by the curse." Shirou's words were met with a disappointed noise from Sakura.

"Did you think, just once, that's the real Rin. She's still a Magus." Sakura's word brought a silence from Shirou for a moment before he spoke again.

"Sakura..." Shirou's voice was quiet, unusual for him.

"I-I didn't mean it as a bad thing but-" Sakura was near panicked as she spoke before stopping as Shirou interrupted her.

"No...you may be right." Shirou slid down the wall as he spoke, sighing as he found himself overcome by emotions he should have buried and now acted like a child, sitting on the ground with one knee to his chest while his other leg was stretched out in front of him and a look of both disappointment at his life at the moment and his own anger at himself. "I just don't want to believe that's the real Rin." Shirou hated the fact but he was near tears thinking that the woman he loved was always the monster she was now. "I really don't want to believe it."

"I could be wrong..." Sakura was lying to herself, she knew she was most likely right. Rin had always been like this just never as bad as she was now.

"No." Shirou cursed his weakness yet again. He was supposed to be above this, forsaking his emotions a long time ago in order to be a real Hero, someone able to take themselves out of the equation and only think of saving people. "I thought I knew her but I didn't."

"Neither did I." Sakura wiped away her tears, despite her own feelings she needed to get Shirou back up again and right now this conversation was only hurting him now. "Now let's finish this Shirou."

"Yeah...I guess we should." Shirou, despite his current feelings, managed a grin. "I've been dying to see if this actually works."

"There's no time like the present now do it...my hero." Sakura's last word made Shirou laugh as he picked himself up, laughing despite all the reasons not to.

'Hero...I'm the farthest thing from one.' It was laughable to think he was a hero, he would never be one after not even being able to save his own wife from her curse.

"Sakura..." Shirou couldn't finish as he pressed two fingers to the earpiece, stopping for a moment to gather himself. "...thank you." pressing down on the earpiece turned it off before Sakura could speak again, something that Shirou was glad for as he highly doubted he could continue speaking to his childhood friends, not with what he was planning to do to her sister.

Realigning his focus, the Enforcer turned towards to what many would see as a dead end, a pointless hallway that lead to nowhere, an oversight in the construction perhaps. He was glad no one knew the truth as he reached under his shirt, drawing out the key at the end of the chain and ripping it off. A surge of Prana through his hand and into the key made it shine, markings on it beginning to glow as he pressed it into the wall next to him, the key easily sinking in and a ripple spread through the wall.

Taking a deep breath, Shirou pushed himself forward, stepping through the wall and gasping as he came out on the other side, falling onto his hands and knees in a sudden exhaustion, panting for breath as he struggled to keep himself. Cursing quietly, Shirou dragged himself up by the railing next to him, hardly even managing to do that before turning and ripping the key out of the other side of the wall, a ripple spreading out from it.

"That will never stop hurting I guess...damn it." Shirou struggled back to his feet using the railing next to him and a moment of fumbling around later his hand found the light switch. "At least the lights are on."

In the present, the raw agony coursing through his body was incredible, far greater than what he had expected, enough to send him falling to the floor screaming at the pain.

'Damn this weak body!' Shirou all but screamed as he rolled onto his back, his hand searching for his cane and failing to find it as another wave of nothing but agony ripped through him. If he knew simply stepping through the doorway would be as damaging as it was, he would have most likely sent Bazett through but now it was impossible. Going through the gate again would kill him the moment he was on the other side, he was sure of it. The only way to go back through now was to get it back and use it when he crossed back through and pray it would keep his cursed body alive.

It took time, most likely seven or so minutes, but the pain eventually abated and Shirou only groaned as he rolled onto his back, quietly cursing Rin for destroying him. The agony he had been forced to endure as he stepped through the door enough to bring back his more annoying memories. The day Rin had cursed him being most prevalent, the agony his body had just gone through little in comparison to what he had gone through at her hands so long ago.

AN: So, since it's clear what will happen, the next chapter will be a flashback that will hopefully explain most of what's happening.

Peace.