Prince and the Pauper, except the twins are different genders, and their best friends fall in love with the other twin? Possible GL or BL? And the prince would be bad at fighting and studying, I.E., his prince studies, but he would be really good at interfacing with other people. And the Pauper would be the exact opposite? I feel like this concept would catch fire on scribblehub but definitely not royalroad.