Ok. So after a massive third (150000 words basically a novel) volume, I am at fourth. Till now, I didn't feel any need to put Yuri in, since it didn't feel natural.
Though, in volume four. It does.
1 - Should I?
2 - It will spoil the story for you.
3 - If there are warning before that section of the chapter we can skip so it doesn't matter. (******* there would be a line of stars at the warning).