Friend Used To Get Us To Hook Up With Her Older Brother

I had a friend growing up that whenever we would get our core friend group together for a sleep over she would try to get us to hook up with one one of her older brother. This was around middle school. All of us at one point or another wound up giving in and would go hang out with him. I always thought he was cute and I agreed to do whatever he told me which included taking my virginity. I wasn't the only one nearly all of us where fucked by him at some point. I always thought my friend was like his wing man knowing that the majority of us had a crush on him. My friend recently apologized to us, saying her brother was having sex with her any time he could and she used us to get a break from his constant harassment. As for why she didn't tell her parents. To them her brother was the golden child and did no wrong. So when she did say something they never believed her.