Mikoto allowed the saber to impale the side of his abdomen. Reinforcing his hand with his aura, he snapped the blade where it entered him, ripped it out, then proceeded to use it to stab Reisi through the chest, all before he even realized what he was doing. When he did, he just stared in horror. He thought he was mentally prepared to kill another King, but now that he actually did it he wasn't even close to having steeled himself.
He just hugged the dying man close to his body, not sure of what to say. Not that it would help. Reisi's smart enough to know he wouldn't be making it out alive. Too much of the Blue King's blood was soaking into Mikoto's clothes. The Red King barely registered the sound of both Servants continuing to fight, unaware of what's going on. Even with Archer's Independent Action preventing him from feeling any negative effects for a couple days if his Path disappears, he probably felt a warning sign that his Master is in danger. Perhaps he did notice and Lancer is just preventing the chance of having his own Master killed.
"I'm sorry about this," Mikoto mumbled before his mind told him to say that.
"Don't be..." Reisi's voice came out quiet, too quiet. "You had to do it...in order to survive..."
"It shoulda be me who dies..."
A chuckle from the dark-haired man, though a wheeze was mixed in. "I'm certain that your Clan and Servant wouldn't take too kindly to it..."
"What about your Clan? Your Servant?" Mikoto hoped he was only imagining Reisi's breathing getting weaker.
"I wouldn't...worry...I don't believe we ever got...as close as HOMRA..."
Now it was Mikoto's turn to chuckle. "You're an insufferable person...But at the same time, I can see people enjoyin' your company. I'm sure everyone in SCEPTER 4 likes you in their own way. And that's why I'm sure this'll crush 'em all."
"You may...be right..." Mikoto didn't believe Reisi's voice could get any quieter than before. But just now proved him wrong. The Blue King was probably fighting to stay conscious. "I never thought...I'd hear comfort...ing words...from you of all people..."
"Then here's something else that'll blow your mind." Before Reisi's dimming mind could even register what was happening, Mikoto had pressed his lips to his own.
"What..?" Reisi managed to say when the Red King pulled away.
"I know I told ya I have someone already...but I think it's somethin' you should have right now."
Reisi tried to snort a laugh, but it came out as quietly as a sigh. He knew he didn't have long. "You're...just full...of surprises, huh..?"
"Hey, you were the one to kiss me first."
"I sup...pose it's...because I secretly...like a...barbarian...like you..."
"You just won't stop even with that at this time?"
A smile from the Blue King. "I...never thought that...I would...say this to you...but thank you..."
A few agonizing seconds later, Reisi's weak breathing came to a stop. And the Blue Sword over their heads dissolved.
- Dead end
