You and Quinn have beenfriends since you were kids, but for some reason your parents didn't get along so you never had sleepovers at each other's houses. And just gamed at the arcade or played in the park.
Now you are is highschool and thanks to the USA school system you don't have uniforms. One day you sit behind Quinn and notice a bra strap stick out from beneath their shirt.
You blink surprised and do a double take. Quinn is wearing a bra? But he is a guy, right? Sure he has always dressed androgynous, and has always been kinda scrawny, but he always played with you like you were guys. He can't be a she, right?
Later while you are walking home from school you decide to ask them.
You: Quinn, are in you wearing a bra?
Quinn freezes and blushes, stunned for a moment but then keeps walking.
Quinn: So what if I am?
You: But you are a guy. Why are you wearing one?
Quinn stops walking again but frowns this time, instead of blushing
Quinn: WTF?! Are you joking? No I'm not a guy! Have you thought that all this time?!