Desperate Aunt

My aunt Christine is my aunt by marriage and married to my father's younger brother Eric. Eric is a know all idiot, believes anything he thinks is always right. He was spoilt as a child and my father John can't stand him for long periods. I'm Richard oldest of 3 and named after my father's late father. Christine married Eric in 2020 and Eric told her she was to provide him with an heir(male). Eric than got ill and only had some intercourse with Christine and she hadn't gotten pregnant from any of sexual intercourse with him. Eric condition wasn't going to improve and he had a condition in his will about providing an heir. I'd met Christine several times and liked her and preferred her to Eric, she quiet where he is loud and obnoxious. Anyway as Eric got sicker and disregarded his doctors advice, Christine worried about her future because of the clause in the will. Then I turned up to see how he was doing only because my father asked me to find out, not willing to go himself. Eric was in hospital again and I was lucky to see just Christine. I'm a lawyer and Christine mentioned Eric will and then showed me it. I thought it could be challenged if she wanted and she would win, but it must have been Eric's own construct as it was woeful as a legal document. Where he made the condition for an heir, he stated an heir with his DNA. Not actually precise and that meant I was able to claim his inheritance as I had his DNA and so could my siblings and cousins on his side of the family. But his intent also makes it mark and it could muddy the waters so to speak. Eric drank heavily, smoked heavily and also done drugs and none of that helped his health. I told Christine as long as she got pregnant to someone closely related to Eric she would inherit, because the will didn't say the child had to be his. I said if you got pregnant close to the last time you and Eric had sex, he wouldn't know. She told me they had a sex before his heart attack and that was 2 days earlier. She then asked me would I help get pregnant, I was a little shocked and also very interested as well. I'm no angel myself and have had a few affairs and fucking Christine would be a secret delight. So I agreed and spent 3 days with with Christine and I enjoyed every minute of my visit and of fucking her. My personal idea of regular visits to fuck her was cut short as she got pregnant and I decided we should know for sure who the father was. So as soon as possible a DNA test showed I was the father, using my status as a lawyer I provide a sample of my DNA as the possible father. But had Eric's name on it and I was the father and a result form showed that me as the donor was indeed the father of the child (girl). Eric was out of hospital at the time and I had gotten a sample from him and showed him the results that had his name on it. That made him happy, but said he had wanted a boy. Anyway he didn't follow doctor advice as was usual for him and he had another heart attack and died. Christine had no problems with inheriting his estate. She sold up everything and moved closer to the family, becoming my neighbor and regularly shares my bed. Mainly for mutual satisfaction, but also because she wants siblings for her daughter. The family think that sperm samples were taken for making more children just in case. So I can fuck Christine get her pregnant and nobody in the family will suspect anything.