I Became Rikuo's Father (Nurarihyon No Mago Crossover)

Greetings, everyone! My name is Bi An Hua. In the Underworld, I'm the spirit in charge of the Pool of Otherworldly Flowers. Every flower in the pool holds the memories of a person's or a demon's entire life. When they are reincarnated, those memories wither and seep into the earth, nourishing the remaining flowers. They become a part of me.

Life went on like that, until the soul of that demon arrived. After that, everything changed.

"Bi An Hua, answer this man's request. Go in his place and live his life again. When the Fox Haguire tries to assassinate you, survive. You may return only once the body inhabited by this demon dies. But just in case, I permit you to use your own abilities," Lord Yama told me one day.

...This man?! Isn't he the demon from another world Lord Yama has been keeping an eye on lately?! Lord Yama... wants me to disguise myself as a man?!

P.S. Though the series is tagged BL, it's actually not certain whether there will be a pairing.

P.P.S. How many stories have I started now...?