Your father decides that you need someone to protect you... so... Here you had a bodyguard..something you didn't know that the first time he saw you..he thought you were so innocent/helpless and really needed protection..so he got yandere..but he didn't really show that...when you were at school..he was basically in your room..you had a fluffy white pillow shaped like a heart, that you hugged, but he was always cuddled it too cuz he could smell your sweet scent.At night time when you were sleeping he always was by your side...he even slept there with you on his chest..and everytime you talked to a boy he had intention to kill him..now you were in your room you just had come from school