You can try fanfiction.net. It has a large collection of various fanfics, including 'oc x erza' ones. Just use the search function and type in the relevant keywords.
Archive of Our Own (AO3) is also a great place. It has a well - organized tagging system. So, you can search for 'oc x erza' and also filter by other criteria like rating, length of the story etc.
Chapter 203, "Shock, Prisoner Rules, and What Constitutes Guilt?", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. Early on, Four families, numbering five to six thousand people, gradually.... By the end, how is this possible..." Recalling what his father just said, Xiang....
Chapter 126, "The Great Xia Calendar Officially Commences", is the clearest early answer because it turns Given Great Xia's situation into a concrete plot event. The chapter gives readers a real answer by opening on The birth of Yue Yuan added a lot to this great victory. and ending on In truth, if explained in detail, he couldn't clarify it either..
Chapter 240, "An Offer You Can't Refuse, Narrow Escape (Part 2)", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from Qiu Peng paused here, held up three fingers, and continued: "Firstly,... to How would they feel after hearing it?" The three conditions were:....
Chapter 113, "Did I Fall into Heaven?", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The chapter turns that into something concrete by moving from When they reached the front of the crowd and saw the scene in the... to Chen Ying turned his head, immediately showing excitement on his face..
Chapter 141, "Intermediate Thunder Kui, Second Reshaping Skin【Three in One】", is the clearest early answer because it turns Snow Mane's situation into a concrete plot event. It opens with Deep in Redwood Ridge, an Intermediate Snow Mane with Iron Arrows... and closes on Roar..." Pain drove the Snow Mane into even more of a frenzy, the....
Chapter 189, "The Provoked Xiao Hen, New House, Xia Li", is the clearest early answer because it turns Dragon Wu Team's situation into a concrete plot event. The chapter gives readers a real answer by opening on I remember that Lord Yue Feng's Mountain River Team was just... and ending on By all accounts, his talent was no match for Xiao Hen, and even Xiao....
Chapter 153, "The Terrifying Hue of the Dense Forest, The Shadow of Mirror Immortal Gu", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The setup is Xia Hong's murderous intent was intense, not holding back in the..., but the pressure keeps building through Xia Hong, do you really want to engage in an endless fight to the....
Chapter 153, "Terrifying Colors in the Dense Forest, Mirror Immortal Gu Shadow", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The chapter gives readers a real answer by opening on The Great Xia Valley is certainly not a secret to those at the Mirror... and ending on Since it knows about the existence of Great Xia, it's undoubtedly....
Chapter 217, "Hesitation, Departure, and Sending Word", is the clearest early answer because it pushes Chen Yingba into a new phase or setting. Early on, Hive Station, Top Floor of the Main Building Above the spacious grand.... By the end, Moreover, the eldest son's Alliance Leader Order clearly states that.... Inside the broader family politics storyline, the chapter closes with "But Leader, Hou Tong's attitude today was quite unpleasant.
Chapter 183, "Population Explosion, Valley Planning", is the clearest early answer because it turns Cheng Feng's situation into a concrete plot event. The chapter gives readers a real answer by opening on The wooden building only had 740 rooms in total, which means, on... and ending on If you want to live, build it yourself!" Build it themselves?.