SHORT STORY: He understood purpose, alright. She asked, he complied. No strings attached, that's how it was going to be... now, it's a need. She didn't want it to end up like this, but for now, this is all they have. He's not done with her yet, and he probably never will. Life is too short, even more so for a SPARTAN – Master Chief x Cortana slight AU – RATED M FOR REASONS