I personally don't find insest disgusting in bl. Personally, I prefer the dad/older brother/uncle(no older than that) to be the seme. Reverse psychology is hard to digest, if you know what I mean.
It gets to a point ಥ ಥ maybe u should put down bl and talk to someone? not too much ofa shocker tbh most smut bl on here portray bad things as something normal/good for a relationship reply