You also have to remember that it wasn't only the boy's fault. Your sister lacked the sense to say NO to that jerk. And I'm sure she's been taught by the school/you/parents that you should say no to sex unless you're completely ready.
So, I think at most, you should get both of them together and talk about the problems of just having sex with whoever- beating up the guy will do nothing but bring resent for you from your sister.
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