Actually, why was the second shit the crown prince? The older one is more competent and was born first... unless he is the son of a commoner or something.
But yeah... big bro always lusted for plainy, but plainy was enganged to his little shit. Little shit was horny, got seduced by a gold digger, renounced his position as crown shit to be with the gold digger so now big bro has the power and can move to be enganged and marry plainy. Lil shit is retarded and that's good for the story
childhood friend though... piece of vomitted shit.