My Stepbrother

My father remarried after 10years a widower and I'm his only child and was happy my father had found a life partner. She also had one child and he was the quiet silence type, in month before they married, I never heard my now stepbrother say more 4 words at any one time. The same age as me and he is good looking and smart but doesn't seem to be interested in joining in conversations or activities. At first, I thought he was against his mother marrying, but he wasn't. It just how he is and once he and his mother moved in with us before the wedding. He was delighted to see a large garage out back of the house and it was mostly unused. He loves cars and he got an old ford mustang to restore. So, he spent many hours working on the car and once finished he sold it. He wasn't interested in owning it, just restoring it. He then looked around and got another car to do up and again sold it once he had finished. Then he got a trans am to do up and the panels were good little rust or damage, the interior was full of dirt, rubbish and rotten seats. Finally, my stepbrother had a job for me, clean out the interior while got the engine and transmission out to get refurbished. Everything was to go from the interior, the carpets and the seat would be removed also. I found $7 and thirty cents in change while cleaning out the interior and was told to keep it. I liked working with my stepbrother, he was quiet most of the time. But we talked a great more than before I started helping. Albeit about the car, when my car started to cause me trouble, he fixed it for me no charge. Anyway, we bonded more and more and one day while working close together installing the new floor covering in the car. We got a bit playful then passionate and then tested the springs and shock absorbers by fucking. Once wasn't the end only the start and we were now in a relationship, that changed last month. Because we married it was, it was expected we would marry after 4 years and 1 child. Still living at home and planning on having more children. He is still quiet as ever, but we know what ever the other wants, just by looking.