Since Peter is a little derpy himself, it probably will not be immediately obvious to him that it's Brian. XD So the antagonizing will totally work. You're more than welcome to have a body part sent to Peter because it'll rile him up like nobody's business, and he'll just be so very WTF IS THING OMG, and it'll give him ~nightmares~. But yeah, I agree completely. Once they start realizing she's missing, Peter'll... snap into action. Or something.
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Since Peter is a little derpy himself, it probably will not be immediately obvious to him that it's Brian. XD So the antagonizing will totally work. You're more than welcome to have a body part sent to Peter because it'll rile him up like nobody's business, and he'll just be so very WTF IS THING OMG, and it'll give him ~nightmares~. But yeah, I agree completely. Once they start realizing she's missing, Peter'll... snap into action. Or something.