upon re-reading I continue to realize how frustrating the concept of cheating is. It just seems completely out of nowhere. I know there were subtle drops that certainly could imply cheating but Reiichi just genuinely seems to love and care for his sister and wife, and there's such a strong emphasis early on of them being a family unit it's just upsetting that he would ruin what he has. I really was fine with a bittersweet ending. Sigh. Years of reading manga has made me so jaded to familiar setups that I wish I wasn't upset by the sudden nature of the potential cheating.
And if it's a misunderstanding then honestly, that might be even worse with Kaoru having gotten hurt so it's a no win situation.
I'll be fine if there's somehow a happy yuri ending in all of this but I'll still always feel like it was a little bit too forced unless there's a really good explanation in all this.