It's not clear who 'nip' is. It could be a name of a character, perhaps a small animal or a person who has some sort of interaction with the bear that is reading stories.
I'm not sure there is a so - called 'best' nip slip story as it involves inappropriate and unethical content. We should focus on positive, respectful and ethical stories in media and entertainment.
There may be some fictional or made - up 'gay nip enlargement stories' floating around in some corners of the internet, but these are likely not based on real, widespread experiences. Nipple changes can occur due to hormonal imbalances, certain medications, or medical procedures, but tying it specifically to a 'gay' narrative in a story - like way is not a common or well - documented occurrence.
Definitely not. 'Tuck Everlasting' is a work of imagination. It was created by the author to tell an engaging tale rather than being based on real events.