You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfictions, and you can easily search for 'Mercy x Reader' ones. There are usually a lot of well - written stories there. Another place is FanFiction.net. It has been around for a long time and has a decent selection as well.
Well, Tumblr can also be a good source. Many fanfiction writers post their 'Mercy x Reader' works there. You can search relevant tags like '#Mercy x Reader Fanfiction' or '#Mercy Reader'. Also, some Overwatch - specific fanfiction communities might have great finds. These communities often have dedicated sections for different pairings, and 'Mercy x Reader' is likely to be one of them.
Chapter 216, "I'm the Director, I Call the Shots!", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The production team also took advantage of the situation to start an...
Chapter 262, "Flash Change Quartet Speaks Out for Jiang Li", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Wen Jiaojiao couldn't stand it anymore and immediately logged onto...
Chapter 235, "Bungee Jumping in Ethiopia???", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, Chasing Wind Youth was clearly becoming anxious, and as a result, his....
Chapter 450, "Your dear brother is making breakfast for you!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with And as he fell, he understood why Lao San had screamed so miserably.
Chapter 666, "It Really is His Mom!", is the clearest early answer because it turns Taiqi Entertainment's situation into a concrete plot event. The chapter gives readers a real answer by opening on The crowd was shocked as they turned their attention to the unknown,...
Chapter 238, "The Guests Were Dumbfounded, The Audience Was Excited", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event.
Chapter 488, "You Must Be the Captain Then!", is the clearest early answer because it turns Ye Chu's situation into a concrete plot event.
Chapter 447, "Going Viral on the Internet", is the clearest early answer because it turns Going Viral's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Old Sir Jiang: "...." His face had grown even worse.
Chapter 388, "All the Rich People in Jing City Are in Jiang Li's Live Room", is the clearest early answer because it pushes Xu Huiqiu into a new phase or setting.
Chapter 323, "This Person Has Ulterior Motives", is the clearest early answer because it turns Zhang's situation into a concrete plot event. The chapter gives readers a real answer by opening on There's such a nuance to all this?!