This story is loosely based on the 'Sunny Day' ending from the Fate/Stay Night visual novel, the 'good' ending of Unlimited Blade Works. An understanding of at least the Unlimited Blade works route is needed to fully enjoy this story. However, if you have not already done so, please either read the ending in the visual novel or watch the Sunny Day OVA done by ufotable. It's not necessary, but it is advised (which is to say it's not necessary at all but it may help)

Although I haven't stated it in the description or anything, future updates may involve yuri between Rin and Saber. Maybe. I've never written it before so I might give it a go. (Although, if there's any, it's probably just going to be really light stuff).

Shirou stood there frozen. All he had to do was deliver the final blow. He had an unlimited arsenal to choose from within his reality marble and Gilgamesh was laying there, defenseless. But that was it; he looked so delicate. The King of Heroes, up until a moment ago, was filled with condescending, iron confidence. But that had crumbled away after Shirou sliced off his arm. Now he lay there, panting and glaring up at the boy, quivering slightly and waiting for his next move.

To the average person, it would appear Shirou somehow broke. The golden King stayed still on the ground and looked up at the 'Faker' with a look of confusion and genuine surprise. Shirou ripped his own shirt to make a bandage for Gilgamesh's shoulder, which was all that was left of his right arm.

"M-Mongrel? What the fuck are you doing?" the King inquired.

"You'll die if we don't stop the bleeding". Shirou replied simply.

"I'm your enemy"

Shirou started. He knew what he was doing, but he couldn't bring himself to kill the man. Sure, the man was trying to cull the human race, but if Saber and Rin were successful, Goldy here wouldn't be able to do that anymore. What use would there be in killing him.

It took Shirou a moment to realise he had said all of that out loud. He stole a glance at the man as he tied the knot of the make-shift bandage. Gilgamesh was in a state of shock, he seemed to be trying to speak, but his mouth was stuck slightly open, his mind unable to process the situation, if his furrowed eyebrows were any indication. "I know what I'm doing is stupid" he said "but I don't care, I can't kill you, and no, I don't know why. He spoke no lie, he was as confused as the heroic spirit on the ground, in front of him.

Rin and Saber stood in, what was quite frankly, complete horror. Rin had renewed her pact with Saber and kept her on as a familiar. It was good that this happened, as Saber could not have made a new pact with Shirou. It didn't take long for them to figure out why. Shirou had command seals again, and the only other servant nearby was the Gilded Asshole.

Saber drew her sword, aware she couldn't really fight, the Grail no longer manifested her. Even if Rin was a magnificent magus, she didn't have the mana capacity to maintain her in full battle right now.

"Wait, Saber! It's ok! I won't let him do anything!" Shirou held up his hand, showing Saber his command seals to try and convince her that this wasn't an act of betrayal. "I just…"

"-You just what, Emiya Shirou?" Saber asked her voice laced with venom. She was mad. Understandably so.

"I… I couldn't bring myself to kill him" Shirou looked down, gritting his teeth. It made him sound like a coward, but it was true.

"Hah!? What does that mean, Emiya-kun?" Rin responded, her glare having changed into a look of concerned confusion. Had he lost his mind? "How did you even… how are you maintaining him right now?" Even with the help of Rin's crest, Shirou shouldn't be able to maintain a servant. Most of her mana was going to Saber anyway.

"I'm trying not to put too much pressure on him, I'm using my own reserves as support" the Golden King cut in. "I'm as confused as you are, trust me" he answered their frazzled expressions. "That's the problem, I don't trust you" Saber replied, glowering at Gilgamesh and pointing her sword at him.

"Wait, Saber…" Rin murmured "He's not being hostile, I… I think it's ok to at least trust Shirou". "I don't trust Goldy but, while he's an idiot, Shirou is trustworthy" Rin stated.

"-But Rin!" "-Saber! The King of knights looked at the ground, biting her lip, then lowered her sword. "Fine" she spat out, looking away, her face twisted into a frown.

Shirou exhaled deeply as the tension dissipated. This was going to be difficult.