Purely accidental. I was buying something in the supermarket when this young mum in her 20s pushing her stroller stopped beside me. While looking through similar stuff on the lower shelves she squeezed her tits unknowingly. Her bra cup was just enough to hold her B cup boobs but her right boob popped out due to the squeeze.
Her small brown nipple just popped out for like 3 seconds. I wonder what goes through the mind of a doctor when he sees this day in day out