That platonic relationship turned into a full-blown one really quickly, aha.
Hylarn obvious doesn't mean official. Are they an official couple? I don't watch the series or the films but I like the pairing very much. In the credits it states that they are an official couple, but fans sometimes confuse canon xD
Also random rambling..
Well, doujin artists are basically fans like us (including their fan-based opinions in the author pages)--and the majority of our opinions are wagering that probably, maybe, most likely, Kyouko/Sayaka and Homura/Madoka are practically canon. Practically, meaning Gen Urobuchi's only hinted at the (barely hidden) romantic feelings so far. But Homura actually "confesses" in Rebellion. I 'unno.
But if you haven't seen Madoka Magica yet, you're seriously missing out. I suggest just watching the first two movies (which recap the entire series) if you don't want to spend 6+ hours watching the series itself. Be aware that the movies actually cut a few things out, too.