I'm not sure about specific 'Meet the Parents Mai Hime' fanfiction off the top of my head. However, you could also check out Archive of Our Own (AO3). It has a large collection of fan works. Maybe look through the Mai Hime section and filter for stories that might involve a'meet the parents' theme. Some authors might be inspired to write such scenarios based on the characters and relationships in Mai Hime.
Another option is to join Mai Hime fan communities or forums. Reddit might have a relevant subreddit for Mai Hime fans. There, you can ask the other fans if they know of any 'Meet the Parents Mai Hime' fanfiction. Fans often share their favorite works or might even be the authors themselves and can point you in the right direction.
Chapter 264, "The Truth", is the clearest early answer because the hidden truth stops feeling like mere subtext. It opens with Jiang Li first reassured her mother, then opened the chat box with... and closes on [Do your faces hurt, you rumormongers?.
Chapter 342, "This is our Hua Country's archery", is the clearest early answer because it turns Horseback Shooting's situation into a concrete plot event. The chapter gives readers a real answer by opening on Some horses fell in the mud pits and never got up, some remained...
Chapter 225, "Just 100,000? Are you buying mineral water for the boss?", is the clearest early answer because it turns Boss's situation into a concrete plot event. A useful checkpoint is the way the scene starts with When Zhao Lang's devastatingly handsome face appeared, all six people...
Chapter 13, "Killing the Chicken to Scare the Monkey", is the clearest early answer because the violence around Jiang Yan becomes final instead of hypothetical. It opens with Sensing that something was off with Jiang Yan, Jiang Yan dismissed...
Chapter 56, "Popular Host L God Actually Supports Jiang Li?!", is the clearest early answer because it turns Lu Xingchao's situation into a concrete plot event.
Chapter 349, "Attempting to Cheat, East Ridge's Strength, Lu Yang's Tactics", is the clearest early answer because it turns East Ridge's situation into a concrete plot event. The chapter gives readers a real answer by opening on Upon hearing these words, Zhu Tong was finally certain that Lu Yang's... and ending on What do you think?" Seeing their expressions of struggle, Lu Yang.... In story terms, the chapter closes with "I had noticed before;
Chapter 448, "Has Jiang Li Gone Crazy?!", 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 Yu Li still wanted to persuade her, "Why not keep everything?
Chapter 78, "If you want to drink the soup made by my sister, wait for the next life!", is the clearest early answer because it turns Is Jiang Yan's situation into a concrete plot event.
Chapter 338, "Rapid Progress, Martial Arts Skills, Dual Eastern Advances, Dormant Phase 6", is the clearest early answer because Xia Chuan finally turns buildup into a real advancement. The setup is At that time, we only need to keep the secret of the hidden passage,..., but the pressure keeps building through Lu Yang, if I remember correctly, you practice swordsmanship, right?"....
Chapter 341, "Moao's Nine Garrisons, the Inspection System and Zhenyu, Li Hu and Hong Yuru (Part 4)", is the clearest early answer because it turns Zhu Tong's situation into a concrete plot event. Early on, After explaining the general situation he had seen, Lu Yang's brows.... By the end, None of them had been to Beishuo before, and it was unlikely that He....