Oh no, people already said it before me.
I agree with wontaek, the way Matsuri said "disappear with me," sounded closer to performing suicide together rather than running away together and live forever. (Since Matsuri went back after to ask Takeshi to teach her how to use the anti-yaka sword.)
If Aono just created Yorito 3 months ago, then WOW she's one obssessed girl. Its been
hundreds of years and she still couldnt get over Yorito.
There are other guys out there. Unless, she's been making Yorito golems. Maybe as time flies by, the golem distructs by itself
And she has to make one over and over which makes her really weak and the last time she made one got her hospitalized. (Stupid theory, I know)
Another thing, I remember Aono saying that she was supposed to be a "sacrifice." Whats that supposed to mean?
Aono should just deal with this and accept how things are and all three of them Aono, Matsuri and Yorito can watch the sun rise and they all disappear happily together. (Yorito fulfilling Matsuri's wish as well.)