Regarding Merce Palau and the specific search query you've mentioned, I couldn't find any information that directly relates to a model by that name creating content with the description "Blackboy Use White Mom." It's possible that this is a specific piece of content or a search query that might not be widely available or recognized.
OnlyFans is a subscription-based platform that allows creators to sell exclusive content to their fans. It's known for its adult content, but not all creators produce adult material.