The writer is probably referring to Fabian LaValle, Fabiruchis, a presenter on Televisa who was recently hospitalized for severe trauma, allegedly because of a beating by a male prostitute, for lack of payment.

K-Pax is probably supposed to be K-Paz (pronounced "capaz"), of the group, K-Paz de la Sierra, recently murdered by strangulation in a string of assassinations among musicians in the banda or grupera genre.

Both incidents occured in the past few months, I believe November in the first case and December in the second.

So "I'm asking you how the fuck you want it" pretty much sounds like a threat on someone's life or at least wellbeing.

I attached a couple of links, the first ones I found, but there are hundreds if you look either incident up on Google.

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Note added at 2 hrs (2008-02-07 22:16:44 GMT)
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K-Paz's real name is Sergio Gómez and was a Grammy nominee

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Note added at 2 hrs (2008-02-07 22:46:02 GMT)
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Sorry, I skipped the translation itself, though I can't imagine this is for publication:

I'm asking you how the fuck you want it: do you want to be beaten like Fabiruchis, or tortured and killed like K-Paz de la Sierra.