I think many people are not trying to hide or forget about Tsubomi bullying the main character, but because the beginning of the story shows that he should choose one of these three people because he is not very normal either.
Another reason is that she may not be the best girl but out of the...
Now it gets a little more interesting because the story doesn't directly tell us that Tanuki loves his sister in a romantic way, maybe it's just familial love.
It would be interesting to give a story of step-siblings who just have a real sibling relationship rather than an incest story.
And I...