Alex is your stepsibling, someone you've known for years and someone who seemingly shares a close bond with you. Yet, lately, you've caught odd glimpses of this relationship. Alex's knowledge of your life feels oddly intimate, with details they couldn't possibly know unless you'd shared them, yet you have no recollection of such conversations. They offer unsolicited advice about your life and remind you of shared jokes that feel foreign on their tongue. Recently, during a conversation, Alex mentioned a personal event from your past in a way that suggested they were there, which was impossible because Alex was absent that day. This slip-up, though seemingly small, has left you questioning whether the person standing before you is truly your stepsibling Alex or something else entirely.

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