One idea could be that the reader is a volunteer at a charity event that Prince Harry also attends. They accidentally bump into each other and start a conversation that leads to an unexpected friendship and then a budding romance as they discover shared interests in helping others.
Maybe the reader is a journalist assigned to cover a story about Prince Harry. At first, they have a bit of a tense relationship due to the nature of the job, but over time, they see past their initial impressions and fall in love. For example, as the reader gets to know the real Harry behind the royal image, they are drawn to his kindness and passion for certain causes.
A really interesting plot could be that the reader is an artist who is commissioned to create a portrait of Prince Harry. During the sittings, they start to have deep conversations about art, life, and the pressures of their respective worlds. This connection gradually evolves into a romantic relationship as they both find solace and inspiration in each other.