I don’t know if this counts(or why you like that stuff in the first place but hey we all have taste) but have you read unfather or Futari no Musial ni Nerawareteimasu? Try those maybe I know unfather is kinda twisted but the second one not so much (〜￣△￣)〜
I think you already read those though but I couldn't think of anything else.
http://www.mangago.zone/read-manga/kusatta_rasen/
http://www.mangago.zone/read-manga/ibitsu_no_kakera/
Try Not Equal.
lol my first thought was http://www.mangago.zone/read-manga/deichuu_no_hasu/
but yeah i also recommend ogawa chise like kusatta rasen
Thanks for the recommendations. It's hard to find these stuff, since stories with adopted only characters are also tagged as incest.
Any recommendations for twisted, real incest yaoi? Like blood-related brothers, father x son, uncle x son. Not those fake, so-called incest where one of the main characters are adopted.