The main idea is that two friends who work together and are both in a long term committed relationship with other people. They have forbidden dormant sexual feelings for each other that they have never acted upon. The conversations are often flirty and one day out of boredom (maybe alcohol is involved) one dares the other to expose themselves in public. One does it and the other follows suit. They both get turned on by this and it becomes an on-going game between them. As the dares increase it turns into actually doing things of sexual nature in public together. I am open to outcomes here.
PM if interested.