The Reincarnated Genderbend Girl Who Helps Her Oni Onii-Chan With His S*xual Desires

In a world where yokai have revived, a pair of siblings lived modestly. However, for the Onikan family, said to carry the blood of demons, there was a price to pay for their strong power. The younger sister, who reincarnated genderbend from her past life as a male, secretly helps alleviate that burden. And then, at a certain point, their relationship undergoes a significant change.