The 'Entity' Inside Me

Rosanna has been dealing with Entity her whole life. They grew up in the same household and got along well as young children, but as time went on, Entity grew jealous. She thought Rosanna had everything; beauty, a voice, everything she could've wanted. Whereas she was just the other child in the household. She was angry when Rosanna reached high school and started dating the guy she liked, but she figured they'd break up and Entity would get to date him. And that's what happened. But Cameron wasn't the guy she expected. Now she's stuck with him, years later. Rosanna met the guy of her dreams while she was stuck with Cameron. She was livid. She knew she needed revenge, but how to get it? Terrorising Rosanna was the best way she could think of. It's been 5 years since she decided that, and it's only now beginning to affect Rosanna.