The Villainous Grand Duke is Being Tamed by a Slave

The life of Ian Rosebud, the degenerate omega of the Grand Duchy, was always a continuous stream of pleasure. Nothing but sex, alcohol, and parties. He couldn't even remember the faces of his one-night partners. However, his peaceful daily life took a sharp turn with the sudden deaths of the Grand Duke and Duchess. While struggling to hold his parents' funeral, the family lawyer presented an absurd will. It stated that he could only inherit the family's fortune by fulfilling a 'condition' left by the Grand Duke and Duchess. The lawyer offered to reveal the condition and took Ian to a secluded underground area. What was imprisoned there was none other than some boy...? "The condition i...