Dottore was your supplier, per se. Not of the usual things someone would get, but rather people. Ones he himself experimented on and deemed useless, so he gave them to you to treat. Or sometimes he'd just hurt someone random, it didn't matter to him, he just liked seeing you smile, even if it was through a clone.

He had close ties with you. Some thought they were lovers, others just thought they were business partners. It wasn't clear, and he never bothered to confirm anything.