My Cousin David

I found out my cousin David 30 was fucking my mother 46 Clare by accident, I had gone off to university and had left my assignment at home. So I returned to get it in a break between lectures. I arrived seen David car in the driveway and didn't think it odd as he was a regular visitor. On entering the house neither he nor my mother were in the lounge room and I went to see where they were. I heard them speaking and it was Clare's bedroom, both were naked and on the bed. I grabbed my assignment and left, I thought to myself lucky Clare. She was getting serviced and I wasn't, my late father is David's blood uncle and Clare isn't a blood relative so isn't incest. My late father Paul was the oldest in his family and David's mother Christine the middle child of 5. David works out and looks great, I've always thought I was his nerdy cousin. I'm Jennifer 24 and wasn't in any relationship or had any either. As an only child I was use to being alone and so I started leaving Clare and David alone when he visited on weekends saying I had to go to the library or some suck excuse. I knew David's fucking of Clare made her happy, as after he started visiting her regularly she cheered up. But then Clare realized I must know of their sexual relationship, by my change in behavior and she asked me straight if I knew. I told how I knew and was happy for her, then she said I should join them. I was shocked by that, but she said it just sex and if I took precautions there would be no problems. Also said it's a great way to start having sex when your not had it before. Clare knew I was still a virgin and with her support I joined her and David and I lost my virginity. David regularly stays the night now and services us both.