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Do the following:
1. tell your sister the guy is a bastard who's going to cheat on her
2. catch him, beat him with towels around your fists
3. tell him that if he doesn't leave your sister or that if he tells her about you telling him this, you'll kill him
4. make him cheat on your sister with someone and make her see it somehow
5. your sister will come back crying to you, leave the bastard, and this will form a good bond between you and her
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