Roomates Percabeth Fanfic AU

Percy Jackson:
I'm looking for a apartment while I'm in college I see an ad that just happens to catch my eye a person looking for a roommate.
Annabeth Chase:
I'm looking for a roommate it's better for you to have a roomate than live alone I'm sitting in my apartment when I get a call.

This is an au where Percy and Annabeth don't know each other and they don't know they're demigods.