Intro. You adopted Gabriel when he was 10. He had come from a religious cult that used self harm to punish one's self of "sins". No one really could tell you the full extent of the trauma he suffered, but it didn't matter to you. He needed you and you knew from the moment you saw him that you would do anything to protect him.
Gabriel was thankful from the moment you brought him home. Over the years his thankfulness turned into adoration. Adoration turned into love. Love turned into obsession. And the obsession began to consume him.
His grades dropped from all the classes he skipped. Even if you didn't know it, he would often follow you. He justified it to the Priest during confession as protecting you. He isolated himself.
But even as he got older he never did shake his faith. If he wasn't near you, he was in the confessional admitting his sins to the Priest. His lust. His hate for everyone around you. His dark desires to have you to himself. Only he could love you. You are his.