Going on a picnic? Totally a thing friends do. Taking dancing classes together? Entirely platonic. I mean they had to learn dancing somewhere right? Maybe the gazing in each other's eyes longingly or the unsaid touches, weren't totally platonic, or maybe the way Sirius bites into the nape of his neck on Halloween, wasn't entirely normal... But who was he to start thinking about any of these things now? There was an upcoming wedding he was to attend, so he had to get his effin shit together. Or Sirius and Remus basically dating but being in denial about it.