"Oh, I hardly know you enough to say if I trust you."

That can be corrected with time, though, and following her own impulses. Kissing the corner of his mouth, the line of his jaw, finding where the strongest pulse beats in his neck and resisting all urges to simply bite down. Old instincts, but a gentle nip can't be bad, if she kisses afterwards to soothe the sting away, working her way down his neck like so.