how to press boobs in school?

There is a girl in our school. She has a awesome big boobs. I want only her boobs. When ever i try to press her boobs she looks me as if i am calling her for a sex. I am not too close to her but i like her brown boobs. I had once seen her naked and had taken a photo during the school annual day and blackmailed her to let me go to press her boobs. For a day she told press my friends boobs they are waiting for. I was not interested in her friends
How to press her boobs???????