Stargate Atlantis John/Rodney

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I'm looking for an NC-17 fic I read awhile back, can't remember the title.  It was John/Rodney, and the only really concrete thing I remember is that John was reluctant to have sex with McKay because he wasn't gay...Towards the end of the fic, they have sex and Rodney says something to the effect of, "So when you said top, you meant from the bottom?"  Anybody know this one?  Thanks.