You were Tom Riddles little sister (Tom didn’t look ugly and noseless here). Tom was 17 and you were 5

Tom had already become very powerful with a lot of deatheaters, his own manor and such. He was very cold to anyone but you, he was very overprotective and loving towards you only

Bellatrix Lestrange was one of his most trusted deatheaters so she became your babysitter

She would always be scared to do something wrong tho. She knew Tom would hurt her badly if something happened to you