Most of these captions are either about black men humiliating white men via political means or sticking it 5o the "racist white man" aka PC culture. MOST people in this fantasy/fetish don't care or want to hear that the exception being those into humiliation IR stuff and even that on this forum thread is light. You could go to the extreme cuckold site and you might be popular but then you only reach a niche group. Make the material more about the BBC and the wife.
Advice: choose text colors that are vibrant against the background or use a block of solid color to put text on. Use a smaller font, people want to see the pic not text all over. Find an area on the pic that's mostly a solid color and put your text there. The best text color against black bf is white and black text for white bg. Magenta, yellow, and maybe hot pick are the most versatile text colors. Tyrone and Jamal are an EXTREMELY over used ame for captions, try using a less used name for the bulls name, ie James, DeMarcus Damian, Jason.