"Is this enough to replenish your exhausted system? I can't robbed much more than this, I still have a few humanity left inside me you know. Also, quiet down your hunger sometimes. You need to properly executed a timely diet so you won't lose that much stocks ina day. I can't afford to refill it in a second." Conrad was deeply burdened by this responsibility given to him, although he was a vampire, he also is specialised to take care of the diseased people here on Earth. Specifically in this state.
"I'm sorry. I, myself, don't get why I suck too much. Must be the longing thirst I have endured ever since then. However, I promise to never repeat the same mistakes again." He genuinely wanted to change his diet, it's affecting Conrad most especially.