Frost was brought into the pack when he was young and Sandy was just starting out as a leader. She saw him as a strong adolescent that could make a good hunter and took him. While he was growing up he started to admire Sandy and her work ethic and aspired to impress her. Knowing it wasn't going to be easy he always put 100% into whatever he did. Eventually, seeing as she hadn't chosen another mate, he confessed. While Sandy's response was less enthusiastic than he would have liked, she said yes (well, more "Okay, why not") and that was enough for him. He doted on her, always doing as she asked without complaint and advising her best he could, even if she rarely listened to him. Mostly he kept other wolves from getting mad at Sandy with his friendly smile and carefree attitude. Even when Sandy started mating with other males he didn't question it, knowing she had her reasons even if it hurt.