This story is a sequel to The Heart of the Sun

For millenniums Princess Luna has stood against the very darkness that cost her, her freedom a thousand year ago the sole guardian of the night. Now a male pony born from the light possessing the dark has enter this Princess of night life. Her first instinct to push this pony away and not get involve with him, let his own mother guide him for she is more powerful than she. But Luna can’t for this pony means the world to her and if she can't guide him from easy path; it could cost him, his freedom. A punishment undeserved for the son of the most noble unicorn knight Princess Luna has ever known.

Princess Luna pic done by Jane Canvas on deviantart