It's rare you see stories about this kind of tragedy factor in an afterlife you can visit. It's a poignant theme but silly in Touhou's case as death isn't the end. The big thing is removing the absolute eternity of the Hourai elixir from Mokou. It defeats the purpose if the elixir, but makes for...
Seems reasonable to me, she could've just as easily done nothing and left him to find his own way.
In the event she dies, she's making sure her son is both taken care of and has a potential spouse to create progeny with. If she's not going to be around she may as well start vetting people she...
It feels like the artist had a different story in mind but decided to change it to hentai at the last minute, it's very abrupt. Reminds me of those early VNs where the porn was tacked on regardless of whether or not the plot warranted it.