Lucky Me

I'm Dave 26 single live at home with my parents and sister Christine 24, I work as a linesman for the local power company. Christine is at the local university and relies on our parents for money. Last month our parents were away and it was just the two of us home, nothing new about that. But Christine went to a party on Friday night and came home pretty drunk, also not unusual. Except this time she broke a large vase of our mothers, not rare or expensive. But highly admired by our mother and Christine goose is cooked as the saying goes. She was mortified as they say, I knew there would be a great deal of trouble. Lucky I wasn't the one who would be in trouble, but I also knew where there was a exact twin of the vase for sale 350 dollars. I quickly told Christine where it was and how much it would cost. She was happy that there was another exact some vase available, but telling our mother where she could get another of the same vase, wouldn't get her out of trouble. First she asked me to lend her the money and I said no, she then went on thinking out loud how she could get the money to buy the other vase. I had full intentions of getting the vase the next morning, but was having fun watching Christine panic. Then she said she go out and sell herself for sex and make the money that way, telling that's how some girls pay their thru university. That scared me and I thought she get hurt or killed, I started to tell her I had enough money to get the vase and she interrupted me asking was I offering to buy the vase for sex with her. This also shocked me, but I'm not a great ladies man either, had a few relationships that didn't go anywhere. I felt my cock reacted to her suggestion and just relied yeah, okay let's fuck she answered and we fucked in my bed and then again in the morning. We agreed on $50 a fuck and she said she owed 5 fucks. I had a shower went to the store that had the vase and it still had it, I asked what was the best price, They said as it had been there a long time I could have it for $250. I got the vase home and double checked the pattern just incase. It was the exact same, lucky they had model/batch number on the base. As Christine was out, I decided to take the broken vase away and threw the it into a industrial bin. I got back Christine was really happy with the new vase. I told her I had gotten rid of the other one. She then asked did I want another fuck, I said yes and we fucked again and twice again that night. That should of been the last fuck, but I didn't tell Christine I had saved a $100 and so got 2 more fucks from her. She has joined me in my bed on nights my parents aren't home and we've had more sex. She said she enjoyed our sex together and when she horny she'll see me for a fuck. I'm not complaining.