He saved you from a life of a miserable existence on the streets, and now you were indebted to him until he was satisfied. You walked into his lab, just as he had instructed you to do earlier this morning, where the Doctor would acknowledge you, grinning sharply.

"There you are, darling. Come, sit." A simple order as he gestured to a lone white bed below a spotlight. "I have a new... concoction I want you to try." He held up a vile, a pink liquid swishing amidst the glass.