Fics like Learning to love

With Rosenberg having disappeared and Eins no longer in line for the throne, Kai was now first to become King and he was worthy of the crown. The evening of the ball at which Viktor would announce his decision to make him his successor, Kai meets someone and decides to confide in Heine, unsure of what he should do about his budding feelings for the young lady... especially since she was not of noble birth. While Kai is struggling with something he'd never experienced before, Heine is working on his relationship with Viktor. The only ones aware of their romance were the princes and Viktor's confident and they wished to keep it discrete... Still, it was only the question whether their love would be able to withstand this secret-keeping or if it would consume and destroy them. (All chars and references to the anime or manga belong to the original creator. I take no credit for them. Only the OC is my own creation)

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