我个人可能Nao不是人类，或者跟恶魔做了交易，以方便自己除掉猎物。当Siren告诉Nao他已经有女朋友时，Nao为了独占他而把他带去属于自己的空间（有点像异次元空间）以便可以让Siren永远在他的身边。当Nao说下一站是中间新建的房子时，可能暗示了他下一个要杀的目标是Siren的女朋友
if you mean the obedient pet you have to choose the good morning option, then tell him you like him, and soon choose the 'okay sure' option when he asks if you can take his hand. Hope this helps you out :D
its 7436 :D
