Fanfiction.net is also a good place. There are quite a few stories about them there as well. However, the interface might be a bit less user - friendly compared to AO3, but it's still worth checking out.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfictions, and you're likely to find many great 'haruka and michiru' ones there. Just use the search function and type in their names.
Chapter 61, "Young Master Before vs After Going to the Countryside", is the clearest early answer because it turns Director Sun's situation into a concrete plot event.
Chapter 436, "Do You Remember Brother Daniu by Daming Lake?", is the clearest early answer because it turns Daming Lake's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Yu Li took the object that resembled a stone axe and weighed it in...
Chapter 131, "This Lady is Here to Travel", is the clearest early answer because it pushes Sweet into a new phase or setting.
Chapter 442, "Let's Form an Alliance", is the clearest early answer because a shaky connection becomes usable in the plot. Early on, Chang Rong was bewildered, "So, she seems pretty impressive." More.... By the end, After all, this had never happened before..
Chapter 350, "Methods to Enhance the Peak of Cold Resistance, Moao's 10th Town, Beishuo Yang Fa, Nightmare, East Ridge Lu Yun", is the clearest early answer because it turns Tiger Power Pills's situation into a concrete plot event. The chapter turns that into something concrete by moving from The first kind of Tiger Power Pill is unclear, but just by hearing... to There is an inherent conflict between the two; smuggling infringes....
Chapter 8, "Is He Shameless?", is the clearest early answer because it turns Qiao's situation into a concrete plot event. It opens with The resentment that had barely calmed among the crowd surged back two... and closes on Other people with a handsome and charming appearance often try to....
Chapter 539, "Aren't these the two who bullied Bai Lu before?!", is the clearest early answer because it turns Let's situation into a concrete plot event. The chapter turns that into something concrete by moving from On the other side of the jungle, Zhao Lang, who was trekking with all...
Chapter 171, "Jiang Yan: There's a ghost!!!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The afternoon rain stopped and started again, making the air even...
Chapter 76, "Who knows if there is poison inside", is the clearest early answer because it turns Aunt Wang's situation into a concrete plot event. Early on, Thinking of this, the aunt repeatedly praised, "Girl, hearing your....
Chapter 443, "Did Jiang Li Steal Team F's Home?", is the clearest early answer because it turns Yu Li's situation into a concrete plot event.