I hadsex with my sister, is it normal?

This has been on my mind for a while now, and I decided to get it off my chest. I have an amazingly sexy sister. Like I mean Hollywood sexy. I haven't always thought of her like this, however recently we've been spending a lot more time together. It all started when we went to the mall together. She was wearing extremely short booty shorts. At first, I thought nothing of it, after all everyone wears them. However, I knew something was up when she repeatedly "dropped" things and went to pick them up. Showing me her beautiful legs and sweet ass. We finished shopping and decided to head home. When we got home we parted ways and did our own thing for a while. Our parents were on a trip so it was just us at home. My sister had bought some panties and bikinis and things like that. I was in bed, on twitter when she came into my room. She was dressed in a deep red thong and very exposing shirt. I could see the lower half of her boobs, even a little nipple. Instantaneously, I had a hard on. She just looked so hot. "Do you like it?" She asked me in an innocent tone. I nodded, the tip of my cock was throbbing. She must of realized because she shut the door behind her and jumped on my bed like a playful little girl. We made out, her tongue entering my mouth and mine hers. Eventually, she reached down for the covers and ripped them off. My cock sprang up and she began sucking on it. I felt so horny I might of came right there if i didn't hold it together. When she was done I grabbed her legs and started massaging her tight pussy. I asked her if she was a virgin and she said yes. Although she had given numerous blowjobs and handjobs. I tore off her panties and began eating her out. She tasted so good by this time she was almost at her climax, so I went extra hard to make her cum. She came and my penis was rock solid. I needed to fuck her right now. I put her on her hands and knees and slowly guided it in her. She was so tight. After a while of going slow I could tell she was used to it. So I decided to speed it up. I went faster and faster and she came again. We switched positions. I put her on her back and spread her legs while sinking my dick into her. I thrust again and again. Pounding her pussy and making her moan. I had almost reached my climax. I pulled out and asked her if she wanted to try anal. Surprising she said yes. We went back to the first position, this time putting it in her ass. I pulled out just as I came and I finished on her back. We both lay there, breathing heavy. Then we got into bed together and went to sleep.