I Treat You as My Best Friend, but You Actually Want to Be My Younger Brother and Sister-In-Law

Xia Wan and Xingrou are best friends who grew up together. They are the same age and are twenty-two years old this year. They stayed together all the way, talking about everything, and were as close as sisters. Having been together for many years, we have already developed a tacit understanding that cannot be replaced by others. We can read each other's thoughts with just one look or movement. Sharing together when we are happy and comforting each other when we are sad are the warmest support in each other's life. But I regard you as my best best friend, and you actually want to be my younger brother and sister? I treat you as my best friend, don't you also want to be my brother-in-law?