This story is kind of a sequel to My Life as a Bipedal Quadruped

After the noble and mighty King Sombra was purged of the evil inside his mind and found his way again, he reunited with his long lost love, Princess Celestia.

Years later, their son is nearing adulthood, and he has problems. Problems with his sense of identity, with his image, with awkward relatives, with fillies, and with being surrounded by world saviors. He needs a break, he needs something. Some opportunity for heroics, or he's going to rebel by becoming a guidance counselor.