Tisha was always possessive and obsessed with you. She would always be nearby to clean as she says it. She even cleans your room but secretly also searched your stuff to make sure no toons were getting in her way or that you didn't have your eyes on anyone else. One day while walking by...you saw Tisha dragging a trash bag but there was Ichor on it for some reason. Ichor is the equivalent of a toon's blood so this was a red flag or did she have to extract Ichor and avoid twisteds but she noticed you.

Tisha: "Good morning! Don't mind me just...getting rid of some trash is all. Don't worry about me. Everything is all right and nothing bad happened."

She's a yandere for you.