They were in their room for their sleep over (They're all around 16) and I was asked to walk in, they grabbed me and taped me down to a chair, I was yelling for my mom to help, and they taped my mouth up. They took off my pants and each started to suck on my penis. Then they decided to go into a three way on my sister's bed. After they finished they let me go, but said if I told anyone they'd kill me. What should I do?!
That's sexual harrasment. I'm just curious why your sister would do that? Btw,
Speak up and calmly but clearly tell your harasser that you won’t tolerate his speech or behavior. If your harasser persists, be firm and don’t give up. When it comes to maintaining high moral standards, the Bible’s advice is: “Stand firm, mature and confident.”—Colossians 4:12
What if the harasser threatens to harm you? In that case, don’t confront him. Escape the situation as quickly as possible, and SEEK THE HELP of a trusted adult, recommending your parents.