Is it normal too have sex with your brother?

Last month I turned 19 and my boyfriend brook up with me, so some of my girl friends took me out to a adult book store that had some video booths. they thought that all I needed was a good fuck, and they were right! I have been to one of these places before but never to the arcade (video booths). The place was dark and the floor was sticky. I walked in to a room locked the door and took a deep breath and put in some money. I noticed there was a hole in the wall and there was a person masturbating, I laughed and he turned to me a stuck hes cock in the hole so I could see it. It was a nice size cock, he shook it up and down so I touched it and started stroking it, and I thought what the hell so I started to suck him off. I said to my self wow I would never do this before, then I started playing with my pussy, it was SO wet! I had to try to see if he would fuck me, so I stopped and stood up and backed in to the hole in the wall and he shoved his cock in me. It was SO fucking good. after a few mins I pulled away from his cock and said put it in my ass and he did. after a few more mins, I noticed it. He came in me! He came in my ass! I was so shocked. I squatted down and said WTF! you came in me! as he looked through the hole and said I'm sorry, we seen each other and fell back. IT WAS MY BROTHER!! We both ran out of the video booths and just looked at each other. just shocked as hell. My friends didn't see what happened. the next day I talked to my brother about what happened. After that I still suck him and he eats me and we fuck! and I let him shoot his load in my ass. I even some time swallow. So to sum it up,

IT'S JUST SEX! IS that normal?