You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). There are a large number of 'Supernatural' fanfictions there, and you can use the search filters to specifically look for Lucifer - related hurt/comfort ones. Just type in 'Supernatural' and 'Lucifer' along with 'hurt/comfort' in the search bar.
Fanfiction.net is also a good place. It has a huge collection of 'Supernatural' fanfictions. However, the search function might not be as refined as AO3. But if you patiently browse through the 'Supernatural' section and look for tags related to Lucifer and hurt/comfort, you're likely to find some great reads.
Another option is Tumblr. There are many fanfiction communities on Tumblr. You can search for relevant blogs or posts using the keywords 'Supernatural', 'Lucifer', 'hurt comfort'. Some bloggers might also recommend their favorite fanfictions, which can be a great way to discover some hidden gems.
Chapter 338, "The Adulterer is Far on the Horizon, Yet Close Before the Eyes", is the clearest early answer because it turns Li's situation into a concrete plot event. Early on, Tang Jinyu, dressed in a light apricot Cheongsam, sat indifferently....
Chapter 210, "Are All of Jiang Li's Fans Hidden Big Shots?", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event.
Chapter 587, "Has He Also Become a Part of the Play?", is the clearest early answer because it turns Isn's situation into a concrete plot event.
Chapter 306, "I Believe Whatever Miss Jiang Says!", is the clearest early answer because it turns Jiang Says's situation into a concrete plot event.
Chapter 669, "My First Love Sister Who Died Young", is the clearest early answer because it turns Xi Yang's situation into a concrete plot event. The chapter turns that into something concrete by moving from Bang," the door closed, but Chen Qijun's words lingered in Tai Fan's...
Chapter 265, "This Time You Must Help Me", is the clearest early answer because it turns Weibo's situation into a concrete plot event.
Chapter 700, "As long as the money is in place, I am willing to do anything!", is the clearest early answer because it turns Shao Changqing's situation into a concrete plot event.
Chapter 404, "The Vice Dean of Hua Country Chinese Medicine University?!", is the clearest early answer because the rescue effort creates visible on-page results. A useful checkpoint is the way the scene starts with Several minutes later, Jiang Li doubled back and knocked on Huo...
Chapter 317, "You Can't Afford to Mess with the Person Behind Her!", is the clearest early answer because it turns Yu Yiyang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He Pingzhang gazed at the man curled up before him, unable to...
Chapter 340, "Holy Heart Hospital", is the clearest early answer because it turns Tang Jinyu's situation into a concrete plot event. The chapter gives readers a real answer by opening on Wen," Lin Manru said quickly, her face full of gratitude.