It's easy, mate. Follow up MacDougal's toy IO with something about size not mattering, offering her advice of sorts, yeah? Mayhaps mention that you've a wand and not a broomstick, but you've not had complaints. Let it go from there. And no matter what might be said to the contrary, you've to insist you've an ickle knob.
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That work?
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Yeah, I'll be doing it, sure, though don't be ruddy surprised if no one's believing it.