Chalk and Cheese

I'm Lauren 32 married to George 34 and he has a younger brother Duncan 30 and sister Margaret 32. But this story is about the brothers, George is the know all type who is never wrong and perfect in everyway in his mind, Duncan is the shy retiring type who stands in the background and out of view as much as possible. Different as Chalk and cheese as they say, I've been married almost 4 years and only this year did finally get pregnant with first child. It wasn't from the the lack of trying, 2 things changed George stopped fucking as much as he was. He lost interest in getting me pregnant, but would fuck me every now and then. He's a self interested person, he come first in his mind and second as well I now believe, I maybe third but I'm not that sure about that anymore. Early this year we were at a function and George ran into some old male friends and they decided to go somewhere else. He left with them taking the car with him, I didn't have any money with or a key to the house either and had to walk the 4 miles home. Hoping he would be there when I got there, I didn't have my cellphone either. Then as I walked it started to rain, luckily a car came along the road. The driver was Duncan and on him seeing me walking stopped and picked me up. The road leads to family properties of George's family so only family cars use it normally. Duncan took me home and George wasn't there and with no key and soaked he took me to his place to dry myself. He was going ring George and I told him not to bother as George wouldn't care as long as I was safe. Duncan said I could use his spare bedroom, I was wearing a sheer dress and it was okay when dry, it seemed to be transparent when wet. So Duncan could see my assets you could say. Duncan is shy around women outside the family and a little shy still with me and we have rarely interacted as much as this before. I was very annoyed with George and then I saw a bulge in Duncan's pants, I realized he had a boner. I'd heard George teasing Duncan before about being a 90 year old virgin before and didn't think much of it at the time. He retreated into his room I went into the spare room and undressed out of my wet clothes. I started wondering would Duncan be masturbating himself no, then I decided why not help him as he had helped me. Totally naked I went to his room catching him cock in hand. Without hesitation I took over stroking his cock while he was still totally shocked. I got him to cum and had gotten aroused myself and decided to take his virginity as well. Duncan was again shocked when I started to suck him off to get him hard again and after he was hard again I mounted him and rode till he came inside me. I spent the night with him in his bed. In the morning I was thinking of my actions the night before and put it down to having a little too much alcohol at the function. But as I laid there I felt little remorse at fucking Duncan and when he woke up, I decided to double down and fucked him again. After showering together he took me home, George's car was there and he was crashed on the lounge and front door wide open. Duncan help me get him to the bedroom and undress him and Duncan then left. I looked at George and thought I must have been mad to marry you. Hours later he finally awoke and didn't remember much besides getting home, I told him he was an animal and he thought I meant sexual animal. Saying I was good then, I was going to tell him off and then decided it would a waste of time. I let it go several weeks later I missed my period and I thought maybe I might be pregnant, but decided to wait till the next period before testing. I also missed that one as well and got a test kit and it showed a positive result and so I saw my doctor and he tested me and I tested positive to being pregnant. I didn't have to be a genius to realize George wasn't the father. The only sex I'd was with Duncan and I was a little shocked at first, but got over it fairly quickly. I told George I was pregnant and the rest of the family as well. Duncan seemed a little strange and when I was able to get him alone I asked what was wrong, nothing he said and then showed the bulge in his pants. He said he had started getting hard-ons every time he was near me after we had fucked. I kissed him on the cheek and said I'll take care that later for you. George was acting normal for him, too dumb to realize he wasn't the father. Anyway as usual for George he went off to do his own thing and I went to visit Duncan. I fucked Duncan twice and told him he was the father of my child and that George rarely touched me these days. Before I got pregnant it had been 6 or so weeks since we last fucked and it was over so quick I hardly remember it. I told Duncan I'll be available to him as George wasn't available to me. Since then I've been regularly fucking Duncan and George is doing his normal stuff, whatever comes to mind without thinking of the consequences. The baby Boy is due in early October and is very healthy. George hasn't fucked me since before I got pregnant, he either has another woman or isn't able to get it up. But I'm getting all I want from Duncan, who is always willing and reliable to help me in anyway. It was mentioned to George he should be around and caring for me now I'm pregnant more. He said I'm always busy and she has Duncan to look after her, as he has no life of his own. I think it would shatter him if he knew about the baby being Duncan's.