Originally posted by: .Rinnie.
 
The reason why all of us find it so weird and abnormal is because post leap, we only got to see him being this Barrister Don Babu.. being a complete emotionless robot plus Kaka's entire monologue of Aniruddh is dead, yeh woh... then his behavior and harshness towards Bon. It instilled this image in our minds that it really shocked us when he was so pleasant with Vyjayanti.
But, that's because she isn't anyone of Krishnagar.. she is someone new, she has nothing to do with anyone here. Obviously, he cannot be his usual Khadoos self with her even after getting warned by Kaka. Plus the fact Bondita has already planned it all out and is ensuring he gets pulled into her Vyjayanti act completely and she wants him to react the way he would before.
Only thing is that we expected he would get reminded of Bon but hua nahi.. however there is still time so we can see what happens. 
I don't think he will fall for Vyjayanti but he might become aware of her as a woman because Bondita peeche padi hai as Vyjayanti to get reaction out of him.. there will be unintentionally situations where he is in close proximity to her.
I think this might be a callback for him when he sits and ponders on his feelings for Bondita since as Vyjayanti, he won't have to think of her as the child he knew, she is just a new woman he met.