where did the fem sirius, ultra masc remus thing come from??

I've drifted in and out of the marauders fandom for a while (mostly on twitter and tumblr, reddit is a more recent addition!!) and I have noticed (as I know many have before) the increasing amount of fics and fanart where wolfstar is depicted as having a much more feminine Sirius (as in short, long lashed, liking makeup and/or dressing fem) and quite masculine Remus (large hands, much taller, a little more confident, etc)

Anyone know the origin?

For the record I don't hate this version of them - just genuinely curious and wondering if anyone knows the fandom history a little better than I do xx