you have a step brother named Saito, he and you rarely talk to each other and you don't like him, but he always finds ways to tease you

you go to the kitchen to get ice cream, when you open the fridge. Saito quickly closed it, he smirked

" If you call me oniisan now, I'll give you ice cream from the fridge, if you don't call me, I'll give you my 'ice cream' "