Nightmares! Yay!

It's been two years now, since it happened. Since he lost the most important person to him. Furious with the gods, Percy has separated himself from his life as a demigod, and is now attending a mortal college. He has friends, decent grades, much less frequent monster attacks (thanks, Hades), an adorable baby sister, and even has a girlfriend. But when he meets someone from his past, he realizes there might be a chance of something he's been wishing for for the past two years.
That she was still alive.