Sakura of DOOM

Oh, this comment reminded me that I'd meant to point out some other Nobuta stories that you might like. They're mostly gen and het and femslash, as well as a few Shuuji/Akira stories that I think include Nobuta in interesting and good ways:

Pattern Recognition by asinful (Akira/Nobuta)
Ugly Ducklings by bookshop (Shuuji/Akira)
Five Things That Changed Since The Last Time Nobuta Saw Shuuji and Akira by ilanabean42 (Shuuji/Akira)
How to Keep a Friend by ilanabean42 (Akira/Nobuta)
Untitled by ilanabean42
Sweets to the Sweet by Mayhap
Stars by mindlint
Untitled Nobuta/Mariko by one_if_by_land
Speed of Light by Pero
Confession Version 2.0//Akira SHOCK(ed)!//Summertime by saxon_dogs (Shittaka/Nobuta) -- You haven't mentioned Shittaka that I've seen, but I think he's adorable, and Nobuta's great in this.
Dear Shuuji by Shay (Shuuji/Akira and Nobuta/Mariko)
Good Luck Pig by shrift (Shuuji/Akira)
Untitled One-Sentence Set by sivullinen (Shittaka/Nobuta)
For a Season by the_suit_case
It's Gonna Rain Tomorrow by walkwithheroes (Akira/Nobuta)
Modern Courtship by walkwithheroes (Akira/Nobuta)
Nobuta in Blue by walkwithheroes (Akira/Nobuta)
Separately, Together Part 1 and Part 2 by walkwithheroes (Akira/Nobuta, Shuuji/Mariko)
Eye of the Storm by waxrose (Shuuji/Akira)
Guilt Free at Three AM, Warmer Together, and The Morning After by wintersjuly (Shuuji/Akira/Nobuta) -- I can't remember how you feel about threesomes, but regardless, I think you'd like these stories. They have very much the feeling of the series to me: romantic friendship might be the best way to describe their relationship here.
Untitled Akira/Nobuta by wintersjuly
Untitled Nobuta/Bando by yamapea