This Is Not the Female Demon Lord I Remembered

"Your handsomeness attracts the attention of the Goddess of Luck at all times."
Liang Yi, an experienced player, found himself transported into the game world. Inheriting the attributes of his god-level alternate account, he started the game with all stats maxed out.
As an NPC favored by the Goddess of Luck, the destined Person of Luck, he had a bright future.
However, he quickly discovered that...
The ruthless and merciless NO.1 female demon lord from his previous life had become his junior sister in this life! And they even formed a contract! If one party died, the other would die as well.
Fortunately, his junior sister before him had not yet turned evil.
To prevent himself from being labeled as the antagonist boss by the vast number of players and being killed, he resolutely embarked on the "Junior Sister Educating Plan."