The incest isn't even the main problem just that the little brother is not well in the head. Being drugged, brainwashed, and then raped ugh.
I do not recommend it.
If u have read this go bleach ur eyes.
DONT READ
If you’re reading this then your parents will die in 5 years. To undo this curse you have to paste this comment on 5 more Manga. I’m so sorry please forgive me. I didn’t want to risk
I saw it so I had to sorry
Yanhomo Otouto ga Ani o Choukyou de SEX Chuudoku ni Shichaimashita