The "kimo debu" thing being left untranslated annoyed me so I spent a few minutes on google and it seems to be something like "disgusting fat"
I know zero japanese so please correct if anyone knows better and actually gives a shit
(dlsite english)
A kimo debu brother buys an ancient book that gives him power over his little sister. Deep sex, blowjob on a three-days-unwashed dirty c*ck, sex during her menses, etc.