I’ve been secretly dating twin brothers and we got caught having a threesome when their sister came over last week. She’s their only sibling, and now she’s threatening to expose us, We decided to start planning our marriage. I can only legally marry one of them, and nobody from either family knows except their sister. Twin 2 told her we’re actually in love and said he’d stop paying for her education if she tells anyone. Now I feel terrible because she’s their only sister, and I genuinely don’t know what to do.