My first fanfic, the one that got me hooked on writing, isn’t coming to AFF because it was inspired by another fanfiction. My head was full of ideas of where it ought to go—thankfully I didn’t message that author with where their story ought to go. I began to sketch things out, immediately wrestled the narrative into my own story, and I’ve not stopped. Like any other fanfiction, I credited the original (and that other fanfic) for inspiration, cobbled together some badly written prose, kept their names for Mr. & Mrs. Granger, kept the name for what might’ve been a Mary Sue muggle that Harry spent his entire fifth year Christmas Holiday...snogging.
It’s sequel is the one I’m still working on, and that’s so different that it’s definitely mine. (Outside of the name for Harry’s GF.)