Now it seems you are the one who's imposing your thoughts on the story. I don't see it's mentioned anywhere in the chapter that she got her memories erased, that just sounds like your own interpretation. Rather, it's more apparent she got tamed by Kiyomitsu and completely switched side. As for her not feeling anything when the clan head was killed, that's got some buid-ups previously when he treated her as a whore and clearly disappointed her, both in images and in bed. Also, mind you, this is still a hentai story in the end, so I'd suggest not trying too hard reading into things. :P
Now that she's getting to know the other girl, one possible sequel idea is they both visit his house, and Hiroko suddenly has to leave for a brief period... ( Í¡° ͜ʖ Í¡°)
I really like this artist a lot, their artstyle, the uniqueness of the story...
There's a mindbreak-ish feeling about this, but at least she seems happy with her new Master.
I've been following the series about this couple for a while. I really enjoy their interactions with each other, like how Kazuki can be somewhat childish and demanding sometimes, and how Yuki does her best to respond to his needs. Also, your art is amazing, I would love to see stories by you on FAKKU!