@ReRead Youre attempting to understand and reason with an insane person. The fact that a person can be described as "yandere" means that they're well beyond the point of reason and logic.
@Cosmist
I believe the point was she used some dream magic on him to basically say what she COULD do. Basically a Yandere who doesn't WANT to kill all her friends to make the MC sleep with her, but is showing him she COULD so he SHOULD sleep with her.
? All the sex scenes are in the dream, the first graduation is left vague, and the second graduation is getting fucked in the dream by yandere glasses elf.
There are many types of Yanderes, it's not a class so much as an umbrella term. https://aminoapps.com/c/dere-amino/page/blog/different-types-of-yanderes/z616_ve3txuBejGeDrjd412P2oNj3DzG8g5
Blame myself for skipping Ch. 3-11 and went to read this chapter because lots of folks were totally flipping. Guess I shouldn't have read any comments and enjoy the story as given.