The only expressions other than smirk I saw on Bani's face was when Pia asked to take kids away. She just realised that her kids trully belong to Pia& not her. May be that will make her marry Jai? SHe seemed to be shocked & curious about AD & Jai confrontation about Turkey. The possibility of a raaz may perk her up & may start doubting AD's intentions.
BTW if Pia's mehendi turned dark the minute it was out on (how it happens only if hubby loves yo. Or may be Pia is going to marry Tony after all 😆 😆 😆 ) Jai written on Bani's hand will be dark too & will stay on right 😳 😳