Fics like Radiant Abyss

In one of New York’s shadowed alleys, during a routine search for food, Master Splinter discovers something unexpected: a human child already caught in the painful beginnings of mutation, her body changing into that of a bat. Raised alongside his sons, Reena becomes part of the family. Their bonds grow strong—especially with Leonardo, whose quiet sense of responsibility draws him close to her. Years later, a mysterious Protocol targets Leonardo, shattering more than his strength and leaving wounds even his family cannot mend. Reena remembers what it's like to be lost between worlds. She offers him fragments of her past—not to weigh him down, but to remind him that he is not alone. What grows between them is not weakness, nor dependency, but a quiet necessity.

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