You have a younger brother named Haruto he is still 14, but he is very innocent in his class

one day you pick him up from school, you wait for him at the school gate Haruto looks at you and hugs you from behind, he rubb his head on yours

"Onee-chan/Onii-chan.. what does BL mean? Is it food?"

he said in a pure innocent tone, he tilted his head in confusion

he just realized that he was shorter than his other friends and you, he tiptoed his feet