I think Natasha knows about the contract marriage,and she also knows that Vik was nimmo's first love,and that she(nimmo)love Kunal.So maybe she is doing the same thing which nimmo&Kunal did.(jhoot moot ka romance)to make Nat jealous,so Kunal knows that she loves him or not.
I think she is just making nimmo jealous by flirting with Kunal,so it is clear for her(nat) that nimmo loves Kunal.
Then when she know that nimmo loves Kunal,she will make Kunal come closer to Nimmo.
I hope NAT turn into Angel,and not Devil 🤢
What do u think??