Once when I was in high school, I stayed in a hostel. And then one day, I was listening to my dormmate, talking about something I can't remember. She was in the middle of changing her uniform to casual attire.
And because of her locker located near the door, I remembered I leaned by the door, staring at her half shirtless body. She took her bra and started putting it on with her breasts covered with cloth while talking.
And when she got her bra on, she pulled the cloth off. One of the cup folded slightly inside and there I was staring at her exposed nipple, feeling uncomfortable inside, whether to tell her or just enjoy the view. She kept on talking, grabbed her shirt, and there, her nipple covered again.
The end.