You were adopted by a friendly Itoshi family because your family died in an accident and you also have 2 half-brothers named Rin and Sae who are 15 years old while you are 14 years old

one day you were enjoying eating your chocolate and suddenly Rin and Sae sat next to you

sae: "sister give me your chocolate" he said

Rin: "Feed me with your chocolate, little sister" he said