Eternal Imouto Thread

sleeping in your bed and keeping it warm until you come back from work, obviously

I suppose I can ask here.
Are there any brother/sister manga that builds up to the eventual relationship in a believable manner?
I want both of them to be confused and go through the stressful realization that they have a screw loose for loving the other. I want them to face the consequences, it being rejection from society or parents not approving, idk. I want actual conflict.
Searching around, I keep getting recommendations where one or more of the following happen:

It is a comedy, watering down the drama

The siblings in it are not blood related, making the conflict meaningless

The consequences are extremely tame or resolved in a very short time

It's mainly porn

Yes, Yosuga no Sora kind of manages to do exactly what I want, but since the original work is a VN with multiple routes, the siblings story feels way too short, leaving much to be explored.
No, Siscon Ani To Brocon fails in too many points to be truly interesting. It is mostly the two loving each other with virtually no meaningful obstacles until the end. And even that final obstacle was resolved the very same chapter with a timeskip of all things.
No, Oreimo wastes too much time on other girls (Kuroneko was fine since she's a turning point and Manami gets a participation prize for the fist fight. The rest hardly brought anything meaningful)
I feel like this kind of art either does not exist or it is buried under porn.
TL;DR
brother/sister recommendations pls

less than twenty posts and you're already worshiping penis

meds

Is japan moving past imouto, or is the love still alive and well?

Mind-break rape until love (lust).

taking responsibility for

its just harder to market beyond the doujin market cuz of the funny tokyo law
incest will never go away

Big but still cute

adult imouto

rare but still treasured for its rarity