Tried and true, the original fic is called “Do you remember?” which was published the past July. “Insanity” (the above named fic) is pretty much exactly the same and is published the past August, a good solid month after. If that’s not evidence of plagiarism, I don’t know what is.
(I’m pretty sure some smart-aleck out there is going to try a “Well maybe the writer wanted to publish it later”…then exactly how does one copy get published a good month before, being the same, if “Insanity” is the “real” fic? Logically, then, “Insanity” is the copy. Unless someone is going to come up with a conspiracy theory and say that both writers knew each other in real life and wrote it together. At which point you need to ask the writers, and they’ll most likely tell you they don’t know each other.But one might say “I got permission to use the ideas”…there’s a HUGE difference between straight plagiarism and making something based on someone else’s ideas. Usually the spin offs are different from what it’s based on. Similar, but different. Plagiarisms are usually the same with minor changes, like the writer’s name or the title of the work)