Heart Source? Where was there a Heart Source?
After walking out of Ryudou Temple, the first person Guinevere thought of was Shinji Matou. But the moment she thought of him, Guinevere felt disgusted, especially imagining his heart placed inside Illya's body.
Therefore, an hour and so later, when Guinevere walked into the Tohsaka House and faced Rin and Archer, she bluntly revealed his truth without even giving Archer any face.
Archer, the future Shirou Emiya, was an unlucky man who had ultimately ended up with nothing by his side in his pursuit of his ideals.
And his wish was precisely to kill the current Shirou Emiya to prevent him from following the same path as his future self.
"Assassin, how do you know all this?"
A cup of black tea, served by Archer himself, he could only face Rin's stunned expression with a look of utter helplessness.
As for being stubborn, Archer felt that since Guinevere dared to say it, she must have decisive evidence.
Unfortunately, Guinevere really didn't have such evidence, only the memories from her past life.
"Archer, since you've admitted it, does it really matter where I found out your True Name?"
"Indeed, it doesn't matter anymore. So you came to my door and shouted my True Name. What is it you seek?"
Rin was still stunned, because she hadn't realized any connection between Archer and Shirou Emiya before this.
And after she summoned Archer, this guy's story was that her summoning was immature, so he had lost a lot of memories, including his True Name.
But looking at it now, it was obvious that Archer had been treating her like a fool.
"What I seek? I want you to transplant your heart to Shirou Emiya, because I will ask Shirou Emiya to transplant his heart to Illya."
As soon as these words came out, Archer froze, while Rin conversely recovered from her stupor.
"Wait, Assassin, do you know what you're saying?"
"Illya is your adoptive father Kiritsugu Emiya's biological daughter. If you want her to live, agree to my terms."
Who was Kiritsugu Emiya? Rin knew very little. But Sakura often visited Shirou Emiya's house, and after a brief investigation, she had already learned the truth Guinevere was speaking.
This was true, and it was also true that Illya was Kiritsugu Emiya's biological daughter. In Rin's mind, Archer would definitely consider Guinevere's proposal.
Though they hadn't spent much time together, after just a few days, Rin knew Archer must be an upright person.
If he was like this, then Shirou Emiya, whom she knew better, was even more so.
"So, why make it so complicated? Can't Archer just transplant his heart directly to Illya?"
She wanted to win the Holy Grail War, but Rin was no heartless woman. When Archer needed to make his exit, she never thought of stopping him.
"Because I want to be sure. Your Archer and Shirou Emiya are the same person, so the organ transplant shouldn't cause much rejection. Even if it's a Heroic Spirit's heart, I believe Shirou Emiya can handle it."
"Fine, since you've gone this far, what about the rejection between Illya and Shirou Emiya's hearts?"
"Archer, you should know the answer, right?"
"Rin, Shirou Emiya's body contains King Arthur's Holy Sword Scabbard. This is the Holy Relic the Einzbern Family used in the Fourth Holy Grail War, and it is also the reason Shirou Emiya was able to summon Saber."
Shaking his head with a wry smile, as the future Shirou Emiya, Archer naturally guessed the source of Guinevere's confidence.
[Avalon], the name of the Scabbard as a Noble Phantasm. When released, it becomes the strongest defense in this world, ignoring all physical attacks, interference from parallel worlds, and so on, forming a truly absolute defense.
While in its normal state, the holder of this Scabbard will not die and will have all wounds healed by the Scabbard.
As long as the Scabbard is given to Illya to hold, she will definitely be able to ignore the so-called rejection reaction.
"Assassin, I know your plan now. I am also willing to die, but before that, could you let me confirm one more thing: whether Shirou Emiya has the right to continue living."
Having reached this point, Archer actually felt somewhat relieved. Or rather, after Shirou Emiya said those words at Caster's wedding, Archer knew that he and the current 'himself' had already set foot on two different paths.
And what about Guinevere? She came to find Archer instead of going directly to Shirou Emiya, so she had already anticipated Archer's current request.
Regarding this, she was happy to see it happen, and it also saved her the idea of using a Noble Phantasm on Archer if necessary.
"Then, the agreement is made. I will go find Shirou Emiya next, and after reaching an agreement with him, I will come back to inform you of the location to test him."
"No need to go to so much trouble, I think he will definitely agree. Tomorrow morning, bring him to the outskirts of Einzbern Castle. That area is a forest, so we can fight without restraint even during the day."
"Tell him that if he doesn't get my approval, the transplant at night will only have one step: transplanting his heart to Illya."
Time ticked away, and the cup of black tea in front of Guinevere had already been finished. Archer, worthy of his title as Housekeeping A, not only kept the normally messy Tohsaka House in perfect order, but this black tea was also the best she had ever drunk in her life.
"Archer, I will convey your words. I'll be going now. Spend the rest of the night talking with Rin. You can even cuddle, after all, Rin is a Holy Widow..."
Spiritizing, she left, and before leaving, she made a joke that was very common in her past life.
But precisely because of Guinevere's casual joke, after only this Master and Servant were left in the Tohsaka House, Rin, realizing something, blushed even deeper.
Looking back, she knew she had definitely messed up the summoning ritual. For example, she shouldn't have stood inside the summoning circle; she should have stood outside it. Or perhaps she shouldn't have forgotten to prepare a Holy Relic and had to use the jewel necklace in her hand as a makeshift substitute.
Right, she had also used that jewel necklace to treat Shirou Emiya's heart.
"Huh?"
Thinking of this, Rin froze again, then gave a self-deprecating smile and stamped her foot in extreme frustration.
"What the hell? I thought I was naturally gifted in healing magecraft, but it turns out it was the power of King Arthur's Scabbard?"
Venting her anger and forgetting her embarrassment, Rin had completely figured out why she had summoned Archer.
But a Holy Widow or something...
"Hey, Archer, in your timeline, did you end up with the me from over there?"
What was the answer? Guinevere didn't know, but it certainly left Rin with a complicated mood, because she didn't even know if she was hoping for it or not.
But knowing that tomorrow, Archer would likely have to offer his heart to Shirou Emiya, she surprisingly didn't throw another one of her young lady tantrums.
"Archer, teach me how to cook again. You've spoiled my palate these past few days."
"Rin, as an electronics idiot, you should still..."
"Archer!"
The Tohsaka Residence was as noisy as it had been the previous few days. Meanwhile, Guinevere had already arrived at the Emiya House, personally informing Shirou Emiya of Illya's problem and her relationship with Kiritsugu Emiya.