Dennis nodded and listened. "Yeah, I was okay at potions. It was close enough to cookery for me, and even though Snape wasn't that fond of me, I did kinda do okay in it." He shrugged. "I spose I can help with that a little. I mean, I don't need magic to stir, or anything."
He knew the way that he handled this question was going to be very, very important. Of course she would be curious. "I ahhh... it's not easy some days. It wasn't that first couple of months," he admitted. "I do have to drink blood, and it hurts when I don't feed. Like if you were starved and denied water as well."
"But in spite of what we were taught in school, we don't need to kill to feed." Sanguini had told him as much. Taking the words he remembered from the older vampire, he tried to talk it up. "A few mouthfuls every few days is enough to sustain. It's only the few who are greedy and have no sense of morals who do give all of us a bad name."
"Like the one who turned me at the battle." Svetlana would probably laugh uproariously at Dennis' little act.
He sighed. "Either I find a willing donor, or I have to go and trick a few drunken revellers every other day. Not exactly ethical, but I get what I have to." he shrugged.