My Bitch of a Aunt

My mother Karen 37 is very shy and a quiet woman by nature, easygoing and her older sister Caroline 40 is a right bitch. Ever since I can remember, Caroline was always running my mother down. My father cleared off when I was 9 and Karen raised me by herself. Luckily we were well off financially due to Karen's trust fund and were given a house by her parents as well. Caroline had married a much older man and lived the high life, she only had 1 child Gerald jr after his father. Both Geralds died in a plane crash 3 years ago. Caroline lucky she had pains in her guts and was put hospital and had her appendix removed and missed the plane trip that crashed. Bird strike was the official reason given, a goose went thru the windscreen of the 2 engine plane hitting Gerald sr and caused the crash. After several months Caroline was recovered enough to start belittling Karen at every opportunity she got. I'm Todd 21 and carpenter single and live with my mother Karen, I've been sleeping with her since we went to the 2 Geralds funerals. After the funeral services at the wake afterward, Karen got a little drunk and I took advantage of her. She has let me sleep with ever since. Last May Caroline came for one her stately visits and started her belittling of Karen as was usual. But this time she was here for the wedding anniversary of their parents and I was able to spike her drinks. She only drinks wine, but I able to add vodka to her glasses of wine and she got smashed. Karen left early to sleep as she had an early start in the morning to take great aunt Elizabeth back to her nursing home. While she was away she was going to do some shopping in the city. So as I was left to look after Caroline, I took her back to her hotel room and took advantage of her. I had her sucking me off and I fucked her and then I fucked her ass as well. I filmed it all and by the time she recovered her senses. I had done just about everything I could think of to her and after she awoke in the morning naked with me in her bed and covered in my cum. She wasn't angry I thought she would be and she wanted to have sex again, she said missed having sex since Gerald died. I said I thought Gerald would have been passed it at his age, she said he was, young Gerald was the one she missed fucking her. You were fucking your son I said. Yes, of course, I was, just like your fucking Karen she said. You know I'm fucking Karen, of course, I could tell by the way she looks at you she replied. So why yo always giving her such a hard time I asked. I've always done that and it's in my nature she replied. I didn't tell her I had recorded me fucking her. On Karen getting home, Caroline joined us for a threesome and stayed an extra week and then returned home. Caroline rang last week and told us she was pregnant to me and I told her that Karen was also pregnant to me. Karen is 2 months further along than Caroline, Caroline is moving back here to live and have the baby.