Uh… I'm not entirely certain this will work, mainly because it seems solely geared towards fulfilling the challenge—and as such, doesn't really strike me as an otherwise well thought-out concept.
Why are there furries involved at all here? What's the background context for that in-universe?
Furthermore, this part:
believe they are the direct children of the Scarlet King (231) and that since they are furries, that it is the Scarlet Kings will to spread furry ideas and yiff as much as they can
feels like it could potentially come off as offensive and cringe-inducing. The fact that you justify this narrative with "sexual was part of the tags I have to do this I'm sorry" only makes me extra hesitant about whether it would actually be a good idea to try and write it.
I don't think this will work without some serious tweaking, sorry. Entertaining the audience should be more of a focus than fulfilling a challenge here.