In the ol5R story line Bayushi Kachiko had a fling with Doji Hoturi. It was one of those more genuine romances that arranged marriages can get in the way of, and when Kachiko was introduced to Bayushi Shoju, and became his wife - the affair was a loose end to tie up. Unfortunately Shoju had some element of "weakness" where he was unable to produce an heir. The fling between Kachiko and Hoturi was reignited and used to "fix" Shoju's problem. The child was unmistakably Hoturi's son, but since Scorpion all wear masks, and Shoju always a mask with complete coverage, the secret was kept.
In this timeline for L5R Hotaru is a girl, and unless they are going to introduce some really awkward kami rituals... this love story needs an edit. Kachiko is fond of Hotaru, and vice versa, so they still have some connection. Maybe they are lovers, maybe they are "like sisters" but either way... they are obviously familiar. Kachiko has spent a considerable amount of time with Hotaru.
Doji Satsume has died and it is a mystery what has happened to him. He was not the best father, or the best person in general. Was he abusive to Hotaru? Hotaru shows no familiar feelings with her father. When addressing the death of Satsume she says "The death of Satsume, Emerald Champion, is a grave matter," but then says "the death of Satsume, our father, however... Perhaps that is justice finally done."
"Justice?" What would the Crane do if they saw the abuse Satsume unloaded at home? In the story Kakita Toshimoko and Kakita Yoshi together were barely enough to urge him to pass on the leadership of the Crane to Hotaru. Would they have simply urged him to stop his abuse? Would they have kept face of the Crane by leaving it a private matter? Are they the "old world" style of dealing with abuse?
Then we have the last piece of my theory - Hotaru was still an obedient daughter, and certainly followed his instructions. He was harsh, but she complied. Has Satsume done more than be a rough and demanding father figure? Did he assault any others around him that would make Hotaru consider it "justice?" She felt he drove her mother off a cliff, but she was unable to act against him...
Kachiko and Hotaru have an honest familiarity, and have spent a lot of time together. Kachiko is no Crane, especially now that she is married to Bayushi Shoju. I speculate that Satsume forced himself on Kachiko, and that Hotaru knew it. Hotaru would be unable to act against her father, but Kachiko would get justice. Kachiko had Satsume killed, and with the full resources of the Bayushi Shoju and the Scorpion Clan it is a perfect cover up that the Emerald Magistrates may never figure out... and we have an heir...
Edited by shosuko