I never would have thought I could get into a situation like that but I will just tell about it:

My little brother is really important to me and when he told me about how this guy I know is treating him I was really mad. So when I saw him the next time I decided to talk to him and make clear that this behavior is absolutely disgusting. However he didn‘t show any sign of remorse but just discussed with me how his behavior was ok, paired with this arrogant style of how he is the perfect guy and because of that is allowed to talk to my brother like that. He combined this with stating that he couldn’t take me serious since I‘m his sister and I couldn’t do anything about it and that I needed to be shown what a real man is, not like my brother.

As I was just more and more mad in this situation I slapped him right there and then left, he only laughed about it. After that I randomly saw him more and more on partys etc.

In one of those it then happened that he made me flirt with him and I began to fall for him until the point was reached where I stopped thinking about everything that happened and I thought I fell in love for him. So we met in private and I let him touch, kiss and fuck me. He still talked bad about my brother but I just didn‘t think about that. He took revenge for the slap by slapping me during sex and the dirty talk mainly consisted of him talking bad about my brother and saying what a slut I am. He was so right but it just turned me on, why so ever. We met 3 times until my brother got to know about it because this guy used it to make fun of my brother and now I‘m the bad sister that nit only slept with this guy but also liked the way how he treated my brother.

I feel so bad for my brother but although deep inside liked the sex so much that I absolutely would fall for him another time. I think I‘m just a bad person but I like to be exactly that.