Okay so the kiddo of Bahu Begum our Noor unknowingly signed NikaahNama while she had pricked her thumb due to ear ring and blood thumb impression that too on Shayra's name.
In past 3 episodes Cvs are showing enough hints that Noor will always be the third wheel. I feel second Nikaah will happen when Faizs will die and Khalid will molest Noor as he seems Pyscho. To bring Noor out of depression Azaan Shayra might go for 2nd marriage plot.