harry potter is not gay. we see what he's thinking the through all the books - never does he think about a guy in terms of attraction or desire... but girls - cho chang, ginny weasley, etc. they have flawless skin or shining red hair the color of the sun...
when characters start making metaphors about the aspects of someone's body, they're generally attracted to that.
and harry never mentions guys with "a voice as deep and soothing as a lion" or whatever.
so canon : no.
obviously, anything and everything can happen in fanfiction.