Otoshigo to Juusha no Monogatari

Kustar is a monstrous-looking slave resigned to dying in his cage, until his fate takes an unexpected turn. Julius, a strikingly beautiful yet aloof young man, purchases him to serve as a personal bodyguard. As the second son born to a concubine, Julius is trapped in a web of bitter family feuds and political maneuvering. His precarious position within his household forces him into degrading compromises, including enduring intimate encounters with male guests to secure his standing. Despite the harshness of his circumstances, Julius maintains a rigid, icy exterior toward everyone around him. Kustar, however, proves to be entirely different from the scheming figures in Julius's life. The imposing bodyguard is remarkably pure-hearted and fiercely devoted to his new master, offering unwavering loyalty without expecting anything in return. As Kustar silently stands by his side, protecting him from both physical threats and the emotional toll of his family's cruelty, the walls Julius has built begin to fracture. Slowly, the cold aristocrat finds himself softening, learning to open a heart he had kept tightly sealed away for survival.