How to deal with Mumbai Police

I (26M) was with my fiancee in the car near Malad Mind space. & We were just talking but our faces were close to eachother. But suddenly a knock happened on the car's window & it was our Mumbai Police. I didn't know what to do as she didn't tell her parents that she was with me. They suddenly ask me to come out & show my license & demand to talk to my parents & her's. But we convinced them that we were just talking on phone with someone.

But for the future reference how should I deal with them if it we were doing PDA? Experience mumbaikar please guide me.