The beginning of Lexa's journey and her acquaintance with Costia. (The 100 fanfiction) "Are you sure? It could be a trap." I warned her, but she just smiled at me and took my hand. "That's why I have to go, not you," she told me, giving me a quick goodbye kiss. When she was at the door, I stopped her. "Promise me you'll be back, Costia." She gave me one last smile. "I promise, Commander."