Fics like Big Sister's Obsession

Mari and Sunny were siblings separated at birth. For her entire life, Mari had always wanted a younger brother. It was her greatest wish to have a little brother to love, protect, and take care of. It wasn't until her parents remarried many years later that Mari got her wish. Sunny is everything Mari could ever want in a little brother. She adores her little Sunny, and smothers him with all the love she has in her heart. Perhaps... too much love. Far more love than any older sister should have for her younger brother. Love that may take Mari down a very dark path.

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