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Mermaid's Cradle

Ael, a merman filled with kindness and generosity. One day, while swimming in the sea, he met "Ort", a lost little merman, and decided to adopt him. Ort grew up quickly under Ael's care, but the attachment slowly turned into an "obsession". Even when he grew into a young merman, he still refused to leave Ael. https://www.mangaupdates.com/series/9xlutvz/mermaid-s-cradle