All alone together

Sixth year, Draco can feel Harry get suspicious of him (though rightfully so).
The two of them hate each other and have since their first year, but now they'll have to work together as they're forced to go through an alternate reality where the entire world is going through the zombie apocalypse.
Now, the two of them will have to stick together as they face off different challenges to retrieve an important item for the headmaster.
Along the way, as the two learn more and more about each other, their feelings might start to change in ways they never thought possible.