I wasn't very close to my dad's second family until last year when I started to work with him, and because of this I started to go to his place more often and know better his wife and my half-brother and half-sister. It was then I realized my half-sister was attracted to me and being a slutty type of girl she didn't even tried to hide it. We started going out making sure no one in the family knew about it. She started to come to my apartment on weekends.