-He starts going on about how Yukio will help usher in an era of true peace or whatever and Yukio is like, cut the crap, your plan is evil, your organization is evil, YOU'RE evil, this whole place is a WRETCHED HIVE OF SCUM AND VILLAINY
-And I'M evil for joining you. I've thrown away everything so I can know myself. I'm here for the power you promised me, and I'm going to get that power.
Hell yes. I didn't think we'd be so lucky to have Yukio allied with the Illuminati while still disgusted with their plans. But here we are, and I am one happy fangirl. This speech is like the dark mirror to Rin's "I'm no demon king or savior!" speech to the Grigori from chapter 14. Since Rin has always bared his soul to the world, seeing Yukio do it is exciting.
Yukio's "If we do live through this, I'll be stronger than you, you can count on that" is Yukio's counterpart of Rin's "Someday I'm gonna surpass you" and if Yukio is planning to do something REALLY big then I'm betting he's willing to fk the Illuminati through and through and save the world. This could be his idea of "surpassing" Rin and get in a position of absolute advantage over him. At this point, I don't think he's aiming to anything less than this. That's the reason for joining exactly the -world's- worst enemy. Not only to get answers, but also to fk them from the inside.
And once he'll be done, he's gonna die or let himself die 'cause he'd reach his top dream and feel accomplished.
Moral is, one more chapter or a couple more to see how this goes and I'm sorry, but I'm gonna need to drop this manga. It'd be more hurtful to keep reading than quit it now.
Yukio will never feel accomplished. No matter how much power he gains, no matter how many things he sacrifices, he will never gain the satisfaction he craves. Nothing will fill that void in his heart.
He's gonna be awful. He's gonna be vicious, cruel, and destructive. He's fallen and has finally accepted this is what he is.
But I'm fairly certain he won't die. That coward doesn't get to die. He has to own up to the consequences of his choices.
Likewise, Rin will survive. He's the main character, for Pete's sake. He's about to get a massive power-up too.
Remember when Mephisto said Shiro was raising Rin until the flames gained strength? This is the culmination. This is why Shiro had to die. So Rin could learn to control the flames through Kurikara, and then access his true power.
And Satan... he's been watching the whole time through Yukio's left eye. IMO that confirms that Satan views Rin as his son, while Yukio is only just a tool. It's things like this that make me pity Yukio despite his viciousness.
-Firey speech bubbles are all STOP FIGHTING YOU TWO, I WILL TURN THIS CAR AROUND
-(Satan: hey don't cover me up)
-We are greeted by Boss Lady, who is like "good work Shima" and Shima is like "Well I didn't do much, he mostly just self-destructed"
I did NOT expect to be rolling on the ground laughing at this chapter. Why is this so heartbreaking and funny at the same time?!