What were your original plans for the cub? It depends on how far would you stretch it. Maybe, he will just be an ordinary prince, still training. Poised to take over, but not yet. Maybe he runs away, perhaps with his romantic interest due to both mentors' pressure expectations. Maybe, he gets the love of his life and the story ends there. Getting the ultimate goal may signify a new beginning but the Roleplay story has already fulfilled its purpose.
You got that right here, unfortunately. Humans are frankly terrible. They will be cruel. The Big Bad. Thankfully, they won't interfere in the story until the very end. (That means no pesky hunters or tourists wandering around! The humans will be mentioned from time to time, however.)
Even that so, I'm going to leave that as a 'Morality' choice to the little cub. That choice is entirely his alone.
P.S. You can also choose NOT to save Mr Senior's shy daughter's freedom from the Lion Farm with your pride mates. I mean, who cares about one lioness being made into a trophy? It's perfectly normal to stay away from Humans! (In this scenario, humans would never appear in the story, but her fate will be made known.)