good grammer and vocabulary:) I encourage you to continue writing. (this girl is a sucker for mary sue.) please keep the story within logic though. I know it‘s very difficult to write a good beginning. If you need a reference on how to keep it from becoming too mary sue I recommend reading „Marie D Suesse And The Mystery New Pirate Age! by Phalanx“ to get a better understanding of the mary sue pit falls (I know the Title and Summary sound odd but the story is at least very eyeopening. please give it a chance). As for a good [ace/oc] plot/romance reference I recommend „Tell it to the marines by Tsume Yuki“ the slow burn makes it interesting and exciting to the readers;). I personally feel that you‘re rushing the romance a little and it kinda leaves me slightly disappointed. I liked how you make Ace chicken out for a few chapters and that Sabo despite his interest tries to be Ace‘s wingman. That‘s suuuuper Cute XD. kinda makes me wish they could have a threesome.
I wonder how she plans to save Ace by joining the marines. Is she going to defect at Marineford? I‘ll be excited to read what you come up with;3. I look forwards to your next chapter

Mary Sue warning!

More... More and more... I need the chapters. Please keep writing. Really love the stories.