Sharing my girlfriend soon to be future wife

I started dating my girlfriend aka wife at 17yrs old. We would fool around at my parents house in front of my siblings. It was brought to my attention that one of my brothers was paying too much attention to my girlfriend/wife. Something inside of me liked that and the idea of being watched excited me. I would her my order brothers fuck girls from time to time. I decided from that day on I would share my girlfriend with my closest friends and brothers. After dating for three months I noticed my brothers would just watche us play fight. I was curious about how my girlfriend would react to being watched by my brother as we fucked. From that point on my girlfriend at the time and now wife.....would enjoy being watched and eventually getting fucked by myself and my brother and then brothers after that by a few close friends and a cousin of hers.