Fusions aren't limited to romance. They are the physical embodiment of love, no matter what kind. Smokey Quartz was a result of the bond between Amethyst and Steven, which clearly isn't romantic (in my opinion, it's more of a brother-sister relationship).
That said, I do agree that it would be a bit weird to see the "new" Rainbow Quartz, although I think that's only because you have to take into consideration what the previous Rainbow Quartz was like…
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GrayVBoat
Feb 17, 2017 at 08:58PM EST in reply to
Zaccharine
Feb 18, 2017 at 02:52AM EST in reply to