I agree with MB that it's obviously Chris' tale. I don't seen Quentin, even in death, confiding in David his biggest darkest secret: [spoiler] his own werewolf curse no matter how much David resembled his beloved nephew Jamison. [/spoiler]
I like to think that maybe Quentin does want to spare Chris any more suffering, but at this point Quentin's spirit is so nasty, not to mention he disposed of Janet Findley and Ezra Braithwaite so callously, I don't see much, if any, humanity in him at this point. Although I thought I did see a moment of sadness on his face when he witnessed Barnabas and Chris digging up the infant's grave and opening up the coffin.
Still Quentin's menace and nastiness is still very much prominent during this period.