My Gorgeous Master Forced Me to be a Spy at the Demon Clan!

Alan reincarnated to a fantasy world, his talents were unparalleled, and his master was a gorgeous female overlord, with powers beyond his imagination! Alan trained through blood, sweat, and tears and cultivated himself for more than a hundred years. Yet as he finally ended his apprenticeship to become a remarkable Demon-method practitioner of his era, his master deployed him to the Demon Clan as a spy! In the blink of an eye, three years had passed at the Demon Clan which was full of dazzling ladies. “Master, I’ve been a spy here for three years, I think they’re starting to become suspicious, I want to go back!” “Just hang on for one more year, it’ll definitely be next year!”  And then another three years passed. “Master, I’ve been a spy here for six years, the daughter of the clan chief seems to have fallen in love with me!” “Never forget your heart! Master believes in you!” Then another three years passed. “Master, the Chief of the Demon Clan wants me to be his heir! He’s gonna....... marry his daughter to me! Your disciple, can’t go back anymore!” “????”