13 Partes Concluida Book One in the Draco Trilogy, written by Cassandra Clare.
"When an accident in Potions class turns Harry into Draco and Draco into Harry, each is trapped playing the part of the other. Romance, mistaken identities, Really Cunning Plans, evil bake sales, a love triangle, and snogs galore."
The following is the work of Cassandra Clare, written before she published The Mortal Instruments, etc.
The plot belongs to her, the characters to J.K. Rowling, and some of the witty dialogue + misc. content belongs to various other entities that are (sometimes) credited by Clare.