If she drinks wine, put a half empty (or half full, depends on how you look at it) bottle of wine in the refridgerator, dont say anything to anyone about it. But fill it up with piss. Chances are she will at least sip on it.
Since his stepmum is American she won't even notice, like the rest of ya. I still think putting her underwear in the desk is the best way to seriously freak her out.
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