Holy cow... I'm usually not such a baby... but when it got to this part-

She gently placed a tourniquet around my foreleg as a tear ran down her cheek. I licked her hand in the same way I used to comfort you so many years ago. She expertly slid the hypodermic needle into my vein. As I felt the sting and the cool liquid coursing through my body, I lay down sleepily, looked into her kind eyes and murmured "How could you?"

I burst into tears. Sorry- too emotional... that is heart-breaking....