My scary Aunt

My father's only sister and youngest of 4, Martha 42 was always something strange to me. A bit scary to me when I first met her 7 years ago at the age of 15. Dressed all in black and with black lipstick and highlights. She looked and acted weird as far I was concerned and I hadn't met her as father Robert 44 was working overseas for twelve years and we only just returned, when I met my father family the first time I can remember. My father, mother Carol 43 and my sister Ruth 19 and me stayed with his parents till our new home was ready. I was shy at first around them and Martha was the one I stayed away from the longest. I've always been good at schoolwork and lousy at sports, I bit of a nerd. I soon was better when I was back at school and doing quite well. Over the following years I got A's in everything except gym. I would try to dodge it as much as possible. But it wouldn't stop me getting a scholarship to the university of my choice and it was then that I was to stay with Martha as she lived near the university. I preferred to live off campus and so I had to stay with Martha. On arrival, I was shown my room and my Carol had come with me for the first 3 days to help settle me in. Martha house was dark all the time curtains closed and strange pictures on the wall, I heard Carol and Martha talking and she seemed to be okay as they talked about the family matters. I found out that Martha lived as a witch and done seances and made charms for people as well potions. She made a good living doing that as far as I could see. So that was why she dressed the way she did, she owned a shop and done most of her seances there. I opened a cupboard door and there was a skull looking back at me. So I didn't look into cupboard after that. Anyway I settled in and was soon not paying much attention to Martha's weird doings. Then she had an accident and she became a little more weird, not hurt badly. She just said she needed to rekindle her protective spirit, on Walpurgis eve. I didn't know what she was talking about and I wasn't all that interested anyway. Later on she asked me would I help her out on Walpurgis eve, as I was the only person who she knew who could. I didn't know what she wanted and agreed as I was busy doing a presentation for one of my courses. I was sure it would be something silly or weird or both. On Monday April 29th 2019 the day before Walpurgis eve she asked me again was I still going to help her and I said yes. Still in the dark at what I was to do. The next day as spring classes had ended, I hadn't really thought about what Martha wanted, that evening she done everything as was normal for her and left me alone. I thought I wasn't needed anymore and went back to getting my ready for Carol's arrival on Thursday to take me back home for the break. I was still up when Martha came to me and said are you ready. I answered yes and still not knowing what was going to happen asked would it hurt. No it will wonderful she replied and she led me the lounge where she candles arranged in the shape of a pentagram. I finally asked what she wanted me to do and shocked by her reply. You are a virgin and I need to seduce a virgin to renew my spiritual body. I replied in a shocked way I'm your nephew and it's incest to sex with you. Nobody will know except us and I promise you will really enjoy the sex and you agreed to help me she answered. I was a little excited I must admit, I was a virgin and didn't think I would get sex with anyone in lifetime. My cock enjoyed the idea and went rock hard. Not knowing how I could get out of it without upsetting her and wanting to have sex. Let her have her way with me, I done as I was told and laid down in the middle of the pentagram. Totally naked and she undressed and danced around saying a chant and then she went down on me. Sucking my cock until I came and she swallowed some and rubbed the rest around her body. Then after I had recovered she mounted me and rode up and down on me until I came again. She then rub me allover and once she had me hard again she fucked me again. We done it several more times and I was totally spent afterwards. I wasn't a virgin anymore and I had grin on my face all the next day. Carol came and we left on the Friday and on my return I wondered would Martha be still happy about us fucking. After Carol had returned home after bringing me back, Martha told that she was happy I was back. I asked did we need to have sex again for her spirit and she no I'm fully recharged, but if you just want a fuck. I'm sure we might have sex again, in the future. Then months after our first sexual night together, Martha told that our union had been blessed. I wasn't sur what she meant, but still smiling told me that she was pregnant to me. You could have knocked me over with feather and asked her how did that happen. Seeing the shocked on my face, she added you left your sperm in me and my egg and it got together and so I pregnant. I then said my parents will kill me for getting you pregnant. Nonsense she said I'm not going tell and is you don't they won't ever know. So I'm now the father of a baby girl Sabrina and Martha lets me fuck her regularly. Nobody suspects I'm the father and Martha told the family, she had IVF.