What I think will be a wonderful surprise is Aahil's words.. that tonight he'll confess at the function... No truer words have ever been said. I believe it would happen too. No matter what happens, at first Tanu will look like she is winning but it would blow up in her face, and SAHIL would end the night in each other's arms. Tanu will still be around to try to hurt sanam, but as I strongly believe Raziya will keep both sisters in the mansion to destroy Tanu, SAnam and Seher will be used in different ways.. but with knowing that their parents were killed by Tanu it won't be a being used scenario but a revenge scenario,.
BUT I think They are going to play this story the way Zoya did to Asad. She knew after everything she tried, Asad always believed Tanu over Zoya. I think that yes, we may get a slap, and Sanam leaves in tears, to go back to the mansion to collect her things, to leave. Aahil will go after her before she could leave causing a big commotion. We'll get our angsty confession,.. but I think Sanam won't believe him if he slaps her. She would tell him, that's not a way of showing love and maybe he does not know what love is. She thought he loved her, thouught she saw his love for her, but maybe she was mistaken. ... She'll taunt him in front of everyone about their dreams of future being shattered. She tells Tanu that she won.. She'll sign. She hopes Tanu could keep Aahil's bed warm for him with all the girls he could want. But she will never care about anyone else but him. She thinks their love was one sided.. she did the loving. She leaves devastated but Aahil goes after her. They meet back at the mansion and he begs and begs.. confessing his love over and over again. Tells her he does not deserve her, but if he gets her, it would be his dream come true...Eventually she'll take him back and we'll get consummation...
Anyway, I strayed.
After all this Sanam, will know she can't any longer tell Aahil or show him evidence.. like Zoya also did with Asad. She has to get Tanu to show her true face to Aahil Like zoya did to asad, when asad witnessed tanu trying to kill zoya..
Sanam with seher will torture Tanu so much, it will make her confess on her own to Aahil without realizing what she did..
AGAIN i'm going to say I do NOT see a switch. RAZIYA says she is going to use BOTH sisters. She cannot use both if one is not there.
UPDATE...What if Seher and Sanam are reunited when Sanam returns to the mansion (after SAHIL reunite) or even at the function. One thing that struck me today is Raziya telling Seher it is dangerous.
The ONLY way I could see a switch is with Sanam being part of that agreement. What if Sanam agrees to be Seher and Seher becomes Sanam.
So when Tanu thinks she is talking to Sanam, she'll be talking to Seher and Khala and Khalu would realize that Sanam has gotten even feistier since the strangulation. A lot more dangerous. I could see after Seher and Sanam expose Tanu, Tanu will be in a fit or rage, she'll aim to kill Sanam when she'll really harm Seher. Raziya saying it would be dangerous raised red flags for me. It tells me that when Tanu is exposed, SEHER will end up dying/being killed, or seriously injured...which will bring a new side of Rehaan.
Aahil who also was not privy to Sanam/Seher/Raziya's plan, will think it's Sanam hurt or dead and be distraught. You see what i'm thinking is, IF there is a switch.. it would ONLY happen around Tanu and the dubbly duo. I think once it's time for bed, Sanam will once again take her place, while Seher goes to her room. I'm thinking Sanam's old room.
Anyay, With Seher as Sanam, the signatures will be diff. But not noticeable at first. Sanam would agree to let Seher sign the papers, to get Taqnu comfortable to finally reveal herself to Aahil in terms of her hunger for power, and when he is about the sign over the transfer to her name, it is revealed that the original papers are null and void as Sanam's signatures on the property papers do not match those of the previous papers she signed, so it is shown that these papers were signed by two different people.
This is the only way I could see a switch working.