1 memory for a comic shoujo:

First year of high school (15 yo), a guy friend from an other school invited me to go out an afternoon on our free time. That jerk didn't tell me that he would come with 8 other guy friends from his year. So I had my own harem the time of an afternoon. And I had a strong connection with one of the friends. At a moment, we were sitting on a bench, and while my new friend was talking, he unintentionally spat his chewing gum...wich jumped into my shirt, on my boobs! I took it off and that guy took it from my hand and put it in his mouth with a smirk on his face.