Have you ever hooked up with one of your siblings friends’ or coworkers not realizing your sibling was interested in them ?

My brother and I use to throw party’s all the time together and invite friends’ and coworkers etc, A mixture of males’ and females’. we would drink and have a good time mingling with each other and having fun , when alcohol is involved anything can happen. My brother never made me aware about a girl he was interested in so I figured she was up for grabs and her and I started making out and having sex , by that time we hooked up my brother was drunk and passed out The next day I told my brother I hooked up with one of his coworkers and he was upset at me for doing so. I told him the truth that I didn’t know he had a thing for her and told him her and I were all over each other that night. Was I wrong for doing that to him considering I had no clue he was interested in her whatsoever? He held that over my head for a long time and I apologized to him a bunch of times and told him I honestly didn’t know he wanted her. I said I would t of done shit if I knew he was interested in her , He eventually accepted my apology and it’s in the past now , but he still busts my chops about it from time to time , Have you ever experienced something like this with your sibling’s friends or coworkers’ ?
Have you ever hooked up with one of your siblings friends’ or coworkers not realizing your sibling was interested in them ?
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