Dennis remembered using the innocent act on Hestia, and the pity that he got from her. He knew just how good a person Luna was, and perhaps he could use this to his advantage.
"I don't want you to be frightened," yet. "It makes me really glad you did like Sanguini, and that you think that he was misunderstood."
He paused a little for dramatic effect. Do you remember that battle at Leicester Square? Well, I kind of found out the hard way that not all Vampires are so good." He gave her a bit of a pitiful look, and hoped she understood what he was saying, biting his lip again and letting one of his fangs show.
"And now Colin doesn't want me around, and well, I have been really having a bad time without my magic..." He was sounding pitiful now, sighing as if he was in despair.
"I'm sorry, I don't want to scare you Luna, I just need a friend."