If it's purely fictional and none of the described activity is happening? Probably not. Having a 10 year old strip is pretty creepy, you will undoubtedly make some people uncomfortable and angry. Your fictional question game could get shutdown pretty quickly if it sounds as though it is tangentially related to kiddie-stripping.
I would think of some PG-13 questions if you want to play that game. Involving creepiness -- even with a fictional 10 year old - can not turn out well for you.
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The fictional question is likely protected by the First Amendment. But posting it could easily put you on the radar of the state or federal child exploitation investigators.
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I see no legal problems with the scenario you posted.
You might want to check the TOS of Yahoo answers to see if they have something to say abut fictional questions.
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