Prosper seemed focused on a novel situation for the undead experience: the lack of ability to indulge the senses. He's asking Mable what she does to feel comfortable with her Curse. He's asking if she's one of those 'Feral Gangrel' due to how she presents (detached from society/trying to re-enter). It's a blunt question, so he's trying to be nicer about it. The police addition seems pointless, maybe just for nesting the coded language?