Omegaverse where the uke and seme are kind of like childhood friends or have met eachother...

Omegaverse where the uke and seme are kind of like childhood friends or have met eachother as kids and the uke was taller than the seme as kids and people expected him to present as an alpha while the seme an omega. but, when they grew older, the uke kind of like flies out of the country and presents as an omega fully expecting the seme to also be an omega when he returns home and reunites with him. But surprise surprise.. the seme presented as an alpha (≧∀≦)