Should I be irritated?

Exhibit A: Kitty Wish, by MSparrow, first published 10/19/04, completed 9/29/05. 11 chapters.

Exhibit B: T·L·C, by Azurite, first published 3/25/04, incomplete.

I found the former story in a C2 archive for Seto x Anzu that was recently nominated for inclusion at BEA. The summary sounded horribly familiar to me, especially with how Anzu got
a) a necklace
b) from Yuugi
c) and she wished to see Kaiba be nice
d) so she turned into a cute cat that vexed Kaiba and learned his deepest secrets
Now, I understand that the stories are different -it's not like I've been plagiarized word-for-word, and I know you can't really "own" a rudimentary fanfic idea, such as "Anzu turns into a cat and sees Kaiba in a new light." But... I did it first, and this looks like a complete rip-off of my idea! >_> Maybe I'm jumping the gun. Am I jumping the gun?

...This idea isn't original. It's MY idea, this person just mooched it off me.

AND DAMMIT, HER NAME IS Téa, not Tea, you lazy asswipes! Use the accent or use her Japanese name! She's not a caffeinated beverage!

...I'll eventually update about this past week, I swear. Ugh, I'm so busy already...