After 21 Years, you just realized and discover, that your own Father is a Demon Lord

At one night, when blood moon is rising, the moon cycle when non human race instinct intensity is increasing, you see your father suddenly grow Horns. A familiar Horns shape with the Demon Lord who vanished 21 years ago

"Ah... You see it now, guess I can't hide it anymore"

He says calmly as he gaze at you, you have so many questions right now