I went to a bbq at my best friend's house and my ex bf was there with someone else I didn't know. When he saw me he played it cool and acted as if we were just old friends that knew each other through my best friend. My friend apparently didn't know he hooked up with one of her friends and it was the first time they showed up at her house. She apologized to me for making things awkward and I told her it's not her fault and I've moved on. Well I was single and horny and we had some shots along the course of the night. His new girlfriend was outside hanging out with her friends and smoking hookah and I was inside the house sitting on the couch a bit wasted. He walked in and asked me where the bathroom was (which I knew he already knew) and told him I'd show him since it was on the second floor. We both went in, locked the door, and I ripped off his pants and started blowing him. I knew we had to move fast so I only did it for a few min and then stood up and let him take me from behind. Everything happened so fast but it was intense and exciting with the thought of being caught. We finished and I walked downstairs and everyone was still outside. He came down a bit after me, smiled at me and went back outside. I never told my friend and don't plan too, and I haven't seen him since and not sure if he's still with the same girl.