She started loving him and becomes all shy when she's close to him(just like what exactly kunal said-blushing scene).I even noticed -though indirectly she speaks li'l openly when a 3rd person is present along with them.(just like convincing to go to party,jagran etc)
I also like their conversation though 3rd person. They both seem to be in a jolly mood and very open when they talk through 3rd person. For example: At Deewali party when Siddhi got so elated after seeing her cards, Kunal said things to Siddhi through seema as they were not in talking terms at that time, the whole dialog which I am not going to repeat as I am sure you remember it very well. I also like when Siddhi shakes her head looking at Kunal If something doesn't go right😆. Wish I can show you which expression I am talking about. I think it's "aap bhi na" expression.
Love it when Siddhi gets really shy looking at Kunal and Kunal catches her looking at him😳. like the one in her B'day party. Also when she shakes her head giving Kunal kind of dirty look. Just too good of expressions from her👏.