Plans never go as supposed to (A Solangelo AU!Royalty story)

Will Solace is the prince of one of the most powerful kingdoms and his father has decided on making an alliance with another very powerful kingdom. The kingdom of Inferis. But King Apollo decided he wanted the hand of one of King Hades' children for Will. He is to be betrothed Princess Bianca di Angelo. There is a slight problem. King Apollo has wronged the wrong person and they have decided to get revenge through Will. He needs to be on the run to escape from them. Only one knight is to accompany Will and the one time he really needed luck, he gets into huge trouble and is stuck the most Gothic, anti-social, cynical, sarcastic and pessimistic person he had ever met until he could find his guard.

Bianca di Angelo has fallen in love with Thalia Grace only to find out she is to be betrothed. She is miserable but wants to complete her duties. Very fortunately she has a very clever brother with a very clever plan. It's simple. Pretend he's going to a summer camp but will be there in time for Bianca's wedding but actually pose as a knight for Will Solace. Then he'll match make him with someone else so Bianca can marry Thalia. Since the betrothing thing was Apollo's idea, they'd still have the alliance. Then everyone will be happy and stuff. Totally fool proof, right? But luck is never on Nico's side. He is ended with the most annoying, happy, laid-back, attra- atrociously calm person to ever walk the earth until he took him to where he needed to go and where the hell is Solace?