Full Sex

My sister had a single vehicle accident and I fixed her and as payment she let me fuck her ass. But it was the best payment as women I dated weren't willing to get ass fucked. Months later she had another accident, but at least she wasn't hurt. But her car was a write off as it had rolled down into a gully. It was an old car but was reliable for her and so I would have to help her someway. I found a slightly later model in fair condition and painted it to match her old car and got everything working perfectly. But a few ass fucks wouldn't cut it this time. But it was a starting point and as our mother is deceased and father long departed it was just the 2 of us. Also, she lost her job due to cutbacks and so moved in with me also. As I was ass fucking her, she slept with me, and I got her to let me take her virginity. No boyfriend and letting your brother fuck your ass, it wasn't hard to get her to agree. But I wanted to take her virginity with a condom and then pull out when getting close. Great plan, one problem, I got carried away and forgot to pull out in time. Realizing as I was Cumming inside of her, what's the chances of her getting pregnant on her first virginal fuck. In her case 100% and to top that she's also having twins. As I'm responsible I've decided to do the right thing, I would be her husband and lover, just not actually married to her. All tests show no problems with the twins, good part of the whole deal is she lets me fuck her almost anytime I want. I told she was virgin when she got married as she had wished, just we didn't know it at the time. she wears our late mother's rings.