Fics
Some of the rare Draco/Cho fics listed at fanfiction.net that I recommend... you may find them worth reading (most/all are unfortunately incomplete):
Deceiving Appearances [rated: T / PG-13] by Tainted-Dreamz
-takes place post-Hogwarts
The Bet [rated: M / R; for sexing] by talesbytheunknown
-AU (doesn't follow canon), during Hogwarts, and I think both characters are in the same grade
The Serpent's Pet [rated: M / R; for sexing] by Moros Morpheus
-AU (doesn't follow canon), during Hogwarts - the war is there.
Deceiving Appearances [rated: T / PG-13] by Tainted-Dreamz
-takes place post-Hogwarts
The Bet [rated: M / R; for sexing] by talesbytheunknown
-AU (doesn't follow canon), during Hogwarts, and I think both characters are in the same grade
The Serpent's Pet [rated: M / R; for sexing] by Moros Morpheus
-AU (doesn't follow canon), during Hogwarts - the war is there.