Visit to my Sister

I'm Greg 25 and last April I went and visited my sister Emma 27 single and work in admin at the local Hospital. Emma is only 4'5" tall and her body is perfectly proportioned for her size. I arrived on a Saturday morning and she was just getting home from the supermarket. We talked while she put away her groceries and then I offered to buy her lunch and we went out and had lunch. After which we had a look around the town together, during the next week we went out for dinners and a movie together. On Friday night, we were going to go to another movie, but there was a weather alert and we decided to stay home. There was some heavy rain and I went to bed around 10 and went to sleep, I was awoken by a loud crack of thunder sometime later and Emma screaming. She had never liked thunder and I went to see how she was, she was under her covers and I started to talk to her to calm her down. I was soon sitting on the side of her and she was sitting up cuddling into me. I thought the storm was passing over and told to back to sleep and as I walked towards her bedroom door there was another thunderclap right overhead. Emma screamed again and I went back to calm her again, this time she asked to stay with her and I could sleep beside her. I got into her bed with her and she cuddled up to me, I was only wearing shorts and I got a hard-on and it poked out of the fly. Emma didn't see it and I thought she would not know about and it would go down by itself. Then there was another thunderclap in the distances and Emma cuddled me tighter, then her hand found my hard-on. She ran her hand all over my cock and started to stroke it. I rolled towards her and she had a big smile on her face, still playing with my hard cock. I started to feel her up and kissed her on her lips and she kissed me back. This led me to start fingering her and removing her panties and then mounting her and she let me without any objections. We were soon fucking and I blew my seed into her and after we went to sleep and had sex again in the morning. Sex became a regular part of my second week with her then I returned home. In late June Emma called me to tell me she was pregnant and I got a job in Emma's town and we're living as man and wife. My mother Emily 51 divorced has also moved with us and is taking care of everything as usual for her. As far as anyone outside our family unit knows Emma and I are married. On Emily's last birthday in August, she got a little drunk and said how she was jealous of Emma as she was getting some and she wasn't. Emma looked at me and I nodded and we both done Emily that night and after she had sobered up, Emily was a bit ashamed of her actions the night before, but with me and Emma feeling her up and we got her back into to bed and she is now a regular in our bed for sex.