What does reverse genji think about having an heir??
He doesn’t, for the most part. Early in his ascension, it was something the elders tried to push him towards, but he was becoming increasingly unhinged and would-be suitors always withdrew early on because they were frightened he’d pull some kind of Bluebeard/Henry the 8th schtick well before a child ever came into play.
Presently, he has come to regard his family with such contempt that the notion that he’d continue the line of succession of his own free will is genuinely laughable to him–when he dies, he wants the whole castle to come crumbling down.
If the Shimada line has any hope of continuing, it’ll have to be through someone else.