Put a Weasley under the Sorting Hat, and it's almost a guarantee-"Gryffindor!"-every time. That is, until Elizabeth Weasley came along.
Her sorting was a shock to the redheaded clan, but perhaps that difference is what allowed her to befriend the one boy she was expected to despise. Instead of seeing a name, she saw the person behind it.
*Slow Burn*
-If you want to jump to the Draco/oc goodness, start at Year 4
-If you want the back story, start from the beginning