Overcoming obstacles is also a prevalent theme. Just like in many stories, the characters in 'A Sign of Affection' fanfictions face challenges, be it misunderstandings between characters, family issues, or external factors trying to come between their relationships. Fanfiction authors like to explore how the characters can overcome these difficulties and grow as a result.
One great 'A Sign of Affection fanfiction' is 'A New Beginning' on FanFiction.net. It explores the characters in new and interesting situations that are in line with the spirit of the original work.
I'm not sure specifically as there could be many novels with this title or related concept. It might be about different ways people show affection in a fictional story, perhaps romantic love, friendship love or family love shown through the characters' actions and relationships.