After the idea of human testing was brought up, Aperture was never the same. There was much more stress and productivity. I loved it like never before.
Cave was always making these "pre-recorded messages" that he put in the spheres that were made for testing. One day, when I was very busy with something, he told me to "Say goodbye, Caroline" and I stupidly said "Goodbye, Caroline." I blushed as he grinned impishly at me.
Aperture became busier and richer, but something seemed amiss. I felt... different. But that comes along later in my history.
One day, at a meeting, Cave brought up another of his great ideas. He hadn't seemed well for a while, and I was getting worried about him. He had started to babble while making pre-recorded messages, as I could tell from walking by while he was on a rant about "burning houses down with lemons". And I had started to care deeply about him.
I loved him.
"We should make a giant robot that we can stick a human mind and soul in," Cave suggested. "That way, they can live forever!"