Family Wedding

I'm Bert 29 single and I returned home for the wedding of my cousin Esther. I work on the other side of the country and this was my first visit since leaving 4 years before. I arrived 4 days before the wedding and found it much the same as before I left. The day before the wedding my other sister Gwen 27 single arrived and we were soon arguing as was normal for us. Then our mother Christine told me I was to be Gwen's Partner for the wedding as we were both unattached. My other sister Dianne was in the bridal party and Gwen hadn't been sure whether she could be back before the wedding day. I had to sit with Gwen at the church and the reception and we were like 2 big children. Many an angry stare we got from Christine and before the reception, she told us we were not too big to get a clip around the ears. I started drinking and Gwen started also, I can't remember how it started. But I awoke the next morning in my motel room with a woman in bed beside me, I didn't remember and she had a pillow over her head. Then she moved and the pillow fell away and it was Gwen, we were both naked and by the cum stains on the bedsheets, we had fucked each other during the night. Gwen awoke and was at a loss for how we ended up in bed together as well. I said I was going to shower and Gwen she wanted to shower also, so I said join me then. So she did and while showering I gave her a feel up and we ended up in bed again fucking. Over the next week, we had sex every day and then returned to our own homes. That was in March and I received a call from Gwen in early May tell me I'm was going to be an uncle/father. I was shocked and all I could say was are you okay. I started looking around for work closer to Gwen's home and was lucky to get a transfer in the company I was working for and arrived back in late June. I was going to find my own place, but Gwen said I should stay with her. So I did, Christine knows I was the father and no one else in the family. Christine had been keeping watch on us at the reception and knew that we had left the reception together. She said she would keep it secret as long as I looked after Gwen and the baby well. Christine gave Gwen her late mother's wedding rings to wear and we started acting as if we were married. We're still having sex and waiting for the baby to arrive.