Let just read off a small description of the weirdest/wildest h manga you read before and see if anyone else has the same search history as you. For the sake of limiting it, let's leave out gore/body horror cause just cause.
Two boys enter a forbidden valley, gets fucked/impregnated by god. Nine months later one boy gives birth out his ass and the other had to give a urethra birth (to help the boy relieve pain his dad did start fucking him during this). But it was ok cause god took the babies and the crops in the village began to bloom