I based it on the original Sprunki's canon, and I wrote about it. I linked to the mod, and everyone knows whose sprites I mostly used, so everything's fine.
Which mod are we talking about? I'm guessing Xeno's, right? You didn't base it on Sprunki's original canon. You based it on XenOthatboi's Misfit Mix. And in Misfit Mix, XenO wrote "Partner || N/A" for Gray and Wenda, and they're just best friends. Changing that isn't "writing about it," it's misrepresenting it. Just putting a link doesn't give you permission to change the author's lore. That's not "okay." It's plagiarism of a derivative work.
It's not plagiarism, you're right. It's your AU and you can do it.
But you said, "I based the canon on the ORIGINAL SPRUNKI." In NyankoBfLol's Original Sprunki, there's no Wenda x Gray canon either. Wenda and Gray don't even interact in the original.
In Misfit Mix, which is the canon that Xeno actually wrote for those designs, it says Partner || N/A + best friend Gray.
I don't have to shut up for pointing out the official fact. Your AU ≠ canon. My comment ≠ hate. End of story.