Kill Me Once, Shame On You.

2 years after the events of Portal 2, GLaDOS is finally rid of Chell and beginning to make some progress with her testing. A package arrives, dispute Aperture's mailing address being eradicated shortly after it's downfall. In it, rescued from the outer most depths of space, are a blue and yellow pair of familiar cores. Disgusted by their return, the motherboard quickly disposes of the two, only later to find herself short staffed and in need of some aid. She quickly makes use of them, and takes every precaution to make sure there is not a relapse of last time. However, Wheatley discovers another human has made her way into Aperture, and is currently being used once again for inhuman testing. Conflicted on weather to just help the girl escape, guilty of his past, or to attempt to take over the complex once again. Events quickly are changed as Wheatley is taken completely off guard when he discovers that his name is listed with the deceased human Aperture employees.