Archive of Our Own (AO3) is a great place to start. It allows for a wide variety of fanfic content and has a tagging system that can help you narrow down your search. FanFiction.net is also a popular platform, with a long - standing community of fanfic writers and readers. There are also some smaller, more niche fanfic platforms that might be worth exploring if you don't find what you're looking for on the bigger ones, but they may require more in - depth research to discover.
I would recommend Archive of Our Own (AO3). It has a very inclusive policy when it comes to fanfics, so it's possible that if there is a 'John Tickle Reader Feet' fanfic, it could be there. Another option could be Wattpad, although it has a more general focus on various types of stories, including fanfics. However, it might be a bit harder to find something so specific among its vast collection.
Chapter 922, "The Good Deed You Did!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Li skipped through those comments and called Zhao Lang back.
Chapter 508, "Isn't this the wild boar raised by Jiang Li?!", is the clearest early answer because it turns Isn's situation into a concrete plot event. It opens with A chill wind suddenly arose, and the team members of Team D hiding in...
Chapter 586, "She Just Likes Men Who Show Weakness Initiative", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. It opens with Jiang Yan quickly swam over to the person. and closes on Then, the egg moved, and after lifting itself up, it sprouted two....
Chapter 677, "Worshiping Sister While Avoiding Them", is the clearest early answer because it turns Tai Fan's situation into a concrete plot event. The setup is You should learn from your sister;
Chapter 608, "Congratulations to Team Q for a Successful Escape!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event.
Chapter 556, "Five-Year College Entrance Exam, Three-Year Simulation", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 891, "If You're a Man, Keep Drinking!", is the clearest early answer because it turns Man's situation into a concrete plot event. Early on, Jiang Yan couldn't bother to coax these two little brats anymore..
Chapter 618, "Abandoned Again", is the clearest early answer because it turns Seeing Su Yinwan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Upon hearing this, Jiang Cheng looked at Su Yinwan in disbelief.
Chapter 9 is the strongest chapter-level answer because it starts from Exactly, the Qiao Family isn't that great either. and follows through on Qiao, unable to save face, slapped her daughter across the face, "Didn't I....