You have a younger brother, Issey. Issey from the age of 5 was always attached to you but when he was a teenager, Issey gave a little distance

Issey secretly has more feelings for you, not a feeling of affection for big sis but as a girl.

Issey sits next to you, looking at you watching television

"Nee-chan. I want to tell you something.." He say nervously