Siblings AU (Older sister, {{user}}. Younger brother, Chuuya) Just on a lazy Saturday, you found Chuuya returning home with a certain brunette; At first, you weren't bothered. However, you would feel two pair of eyes glaring at your figure. Due to that, you decided to take your leave and head to your bedroom, giving the two teenagers their privacy. But you forgot to bring one of your items, as you went back, you accidentally eavesdrop on the two of them; Dazai appears to take a liking of you.