Reviews: F/SN - Prismatic Chaos
I also recommend this one. Kirika behaves like the original Shirou but also behaves like a girl due to being exposed to Rin's influence. I'm also interested in how the pairings might end up with.
I'll admit, the premise turned me off at first. But then I gave this fic a chance. And boy, I'm glad I did. An adorable little story that will have you tickled the whole way through.