@Jyo: I was thinking about the Nikaah scenario, and interestingly from what I see on the show now, I think we might see it, but with a twist. I think we might actually see Prashant being the one to tell Yash about their past, all the gory details which Aarti would be too graceful to disclose. From what we know of Aarti, she would never tell Yash how Prashant treated her, only the bare facts maybe to the extent that he left her before Ansh was born. Instead, she would take full responsibility for the lie and quietly take whatever punishment Yash and the Scindias wanted to give her. Here might be Prashant's real redemption where he tells Yash
a. About the past and how he treated Aarti, why his parents told the lie in the first place
b. That he was the one who saved Aarti and Ansh in Lalitpur
c. That if Yash wanted to pay him back for that "ehsaan" he would have to accept Aarti and not punish her for Prashant's mistakes.
This would get Yash thinking about how he really feels about Aarti, and whether he wants to be the bigger man here and instead of simply being mad at her, try to understand the circumstances that forced her to continue lying to him, material and emotional. They are building up this bond between Yash and Prashant for a very valid reason, and I feel Prashant might be the one to tell Yash and Aarti not to make the mistake of letting go of something real. I want him to tell Yash that he has never seen Aarti so happy!