Yep, I'm in iy_flashfic and also bleach_flashfic. There's not a community solely for royai flashfics that I know of, but there is one for fma flashfics at fma_exchange. I haven't petitioned to get myself added to that group simply because a majority of the yaoi pairings don't really appeal to me. I may join someday to broaden my horizons, but not yet. I'm still content with Inuyasha and Bleach ^__^

I think there's also one floating around for Prince of Tennis, but I've never watched that show so I haven't looked any further then hearing mention of it. Good luck in getting accepted into iy_flashfic, and if it's been more than two weeks since you petitioned to get in you may want to prod the moderators since sign-up deadlines for the next round are coming up in the next two days. Real life sometimes distracts them and they forget, but they're nice people as long as you're nice in return ;p