So I have this friend who is a Korean. She's a lot shorter than me. So we were walking down the street. As usual she would share things about her and her ex. It does get annoying some times. Anyway, we are just friends. It was pretty hot so she took off her sweater. She was wearing a tank top and I could see her nipple from the top. It is my first time. I dunno, it seemed that she was wearing a bra much bigger than her b******. Anyway it was pretty obvious. I just kept quiet as I didn't know how to bring it up to her. What should I have done ? Btw I'm a guy.