I decided to draw Rubi and Onyx as adults. though their size difference is notable.

So both Onyx and Rubi grew up liking baking mostly. Rubi loved to bake, and Onyx favorited taste testing and being the heavy lifter for her. though over time it is notable that Onyx is much larger then her, but also much more durable. Regardless of their size differences, they enjoy and love working together, baking and taste testing bread.