- The novella "Ur", which appears in The Bazaar of Bad Dreams. A college professor mistakenly receives a magic Kindle which can display works and news articles from other timelines. Unlike many a King character who gets their hands on such a MacGuffin, he uses his newfound knowledge and power entirely for good, saves the lives of his girlfriend and her student basketball team by changing the events that would have led to their deaths, and though he gets a slap on the wrist from the inter-dimensional police and loses his magic Kindle, he gets an untarnished happy ending.
Heartwarming / Stephen King
In the middle of all the terror in King's work, one can find this bits that make all the horror worth it to his protagonists... and his readers.