This is basically Nightfrost in a nutshell: Nightfrost was a black cat who thought she was nothing. Her parents died when she was a kit. Her littermates died of greencough. Then she was named deputy, and was overwhelmed. Then she met Blackstream, and her feelings swirled. She was in love. She saw him with Ivyleaf, and her hope fell. Inviting him to hunt, she realized he felt the same. She was blessed by StarClan, now because of Blackstream, she knows that she was never nothing, she may have felt it. But to Blackstream she is everything.