I feel like a lot of you are missing the point and fail to put yourselves in a 12-year-old's shoes who probably had absolutely no concept of sexual attraction yet, and was literally pinned down by force, having absolutely no choice and say into what was gonna happen next.
Soo, let me try to get this straight:
-Something happened to Himawari in 4th grade which resulted in her being hospitalised
-Kaede, at that time already working as a nurse, felt sorry for her and created a doppelgänger of Himawarai and herself who then went on to have a blissful youth as if...