Adult PC Game: Bravery Ordeal - The Tale of a Human and Succubus's Child v1.3 by Ao Sakura Archive

Born to a human father and a succubus mother, the protagonist was raised as a human, unaware of his mixed heritage, kept secret by his parents.
On the night of his coming-of-age birthday, a mysterious succubus appears and abducts his mother.
Determined to rescue his beloved mother, the protagonist embarks on the "Trial of Courage".
Along the way, he must face and resist the seductive temptations of various succubi lying in wait...
This is his story.​