An unusual proposal

The hunt had just completed a particularly tricky hunt against the infamous Kalydonian Boar so were stopping in at Camp Half-Blood to rest up, and of course further their winning streak in Capture the Flag of course. 19 year old Percy was stopping in order to catch up with his cousin and the hunt. How can a simple spar between our favourite lunar goddess and the son of the sea have so many consequence?

Pertemis one-shot. (Spit into 4 parts for convenience)