That might change some things but generally as a rule of thumb if you create a couple of characters that you stick with for that long and you genuinely like them, then there's a really low chance that you haven't thought about them in an R34'y way.
Whether you act on those thoughts is totally up to your moral standing. But with Nefcy, she doesn't seem the type to be above it. And that's totally cool.
That said, if your characters reach a level of recognition like Star VS, you're already very satisfied with how they are and don't feel the need to fulfill any of those R34'y thoughts.
It's just messing around, really. If she wants to mess around, it's totally up to her.>>92098788
Of course this is why she couldn't release anything ""official"". But like >>92097773
said. Under the radar? With a bit of stylistic trickery? She totally could.