[MF] first time seeing a girl in a bra

I have this female friend, we are friends, but not very close. One day she was working a job at a place I was also working at. She asked me where she could change her shirt to the uniform one, I happily showed her an empty room we have for changing. I expected her to send me away, but she took that shirt right as the door closed. She had quite large breasts, probably D or E cup, packed in a sports bra. They were nearly squished together. Then she just put on the uniform and we walked away. That’s the whole story unfortunately.