Desperate for Money

My sister Carol 23 is at university and was having trouble finding work to pay her bills. Our parents help as much as they could but it wasn't enough to help Carol without her working. I'm John 29 her only sibling and also live in the same city as Carol and I bought my own house a 2 bedroom 1 bath a bit rundown cottage and I'm doing it up as money comes available. I have a good job and get fairy good pay and was paying off the cottage as quickly as I can. Every now and then I get extra work and cash and use it to fix up my home. To help Carol I got to stay with me rent free and with money from our parents going on university fees and books and very little left for anything else even clothes. Then she made up her mind to make extra money by selling herself, like other girls do to pay their way thru university. I told her that was dangerous and anything could happen to you and your pimp would take most of your money anyway. I told her I would give her a hundred dollars and pay my home off a little slower, but only if she didn't become a hooker. Carol said she would think it over and let know, anyway a day or so later she accepted my offer. But after a couple of weeks I noticed her looking at me a lot and finally asked what was wrong. Nothing wrong I've been thinking I should do something for you and all your help she answered. I didn't asked what and left at that, then on the following weekend I went to Saturday night and shortly after Carol came into my room totally naked and got into my bed with me. I was shocked and asked what are you doing, you hopefully she answered and took hold of my cock and started to play with it. I could I was shocked and unsure, but I had realized she wanted to fuck me and my cock had already gotten hard. So I fucked Carol and since then she sleeps with me every night and we have regular sex. It doesn't hurt anyone and we both enjoy it.