Then why not just call it "Rei/Shinji fics" then?
"Our magic is not omnipotent. A little bit of courage is the true magic."
–Negi Springfield, Negima: Magister Negi Magi
"Where there is distress, therein lies a story. Where there is a story, therein lies a will. And wherever there is a will, therein lies a soul."
–Evangeline A.K. McDowell, Negima: Magister Negi Magi