Tom and Harry.. that must be the most ridiculous pairing since some fangirls came up with Harry/Draco & Harry/Snape because they liked the looks of the actors.
These stories have nothing to do with Harry Potter, because hetero males do NOT wake up one morning and think, "you know, I really prefer men, and now that I think about it, those guys I totally hate and who totally hate me are actually quite sexy, so we should get it on..."
It's a shame all the yaoi fangirls can't find a dedicated site and post their fantasies there, so that the rest of use don't have to wade through slash to find real Harry Potter fics.