In an interview with Entertainment Weekly, McQuiston said that she would love to write a sequel to Red, White & Royal Blue. She said that she has "a lot of ideas" for where the story could go, but that she is not sure if she will ever write it.
McQuiston said that she would need to find the right time to write a sequel. She said that she does not want to rush it, and that she wants to make sure that the sequel is as good as the first book.
If McQuiston does write a sequel to Red, White & Royal Blue, it is likely to focus on the relationship between Alex Claremont-Diaz and Henry Fox-Mountchristen-Windsor. The first book ended with the two characters getting married, and the sequel could follow them as they navigate married life.
The sequel could also explore the challenges that Alex and Henry face as a biracial couple in the public eye. The first book touched on this issue, but it is likely that the sequel would delve into it more deeply.
It is also possible that the sequel could introduce new characters. The first book focused on Alex and Henry, but there are a number of other characters who could be explored in a sequel. For example, the sequel could focus on Alex's sister, June, or Henry's brother, Philip.