Sinister Sister

Dear Mistress Doomcannon:
Help! My little sister's fallen in love with *gag* my archenemy, who is, of course, a hero!! I can't believe she'd betray her evil roots in such a fashion! What do I do to break up this unholy union?
Sincerely,
Enraged Evil Sister

Dear Sister,

My first insitinct was... kill her! I realized, however, there is a possibility we could be retiring one of the most brilliantly twisted minds in the history of no good... or not. Risky buisiness there. There's the next easy solution... kill him! Too easy though. Villainy is an art. Without the creativity, you're just another criminal. The best way to go about this is to use the power of love to turn him to the ways of evil. If your sister is the true queen of sinister that I hope she is, she'll happily cooperate. If not, she never had the potential anyway. Kill her.