What metaphors are used in The Good Fairies of New York by Martin Millar?

The story itself can be seen as a metaphor for unconditional live. Kerry is a sick woman who suffers a disease that has caused her to require a colostomy bag. This colostomy bag is possibly temporary, but every attack of her illness leaves Kerry open to the possibility that she will have to have so much of her intestines removed that the colostomy bag will become a permanent part of her life. Kerry is young and single and would like one day to be with a man who cares about her. However, the colostomy bag makes this difficult. Kerry's last boyfriend, Cal, broke up with her when he learned about the bag. Kerry is angry about this and hopes to one day find a man who can love her, colostomy bag or not. When Kerry meets Dinnie, he seems like the last person on earth who would accept the colostomy bag. However, in the end Dinnie proves to be the only human who can.