The Demon in Love

Humans do not interact with demons. Demons do not interact with humans. That was the rule. However, one desperate time called for a desperate measure. In order to live, a demon child was offered half the life of a human child. All his actions would affect the human's life, although the human's actions would not have a great effect on his, but it was still there. That was the condition, and it was accepted. Zeth, the demon, and Sarah, the human, shared the same life, same breath, same burden. Both should not interact, that was the rule, but what if fate itself connected them together?