After two days :
When  every one is sitting in the living room and chit chatting  every heard that some one has shouted Ahhh. They went saw there then there was rohan lying on floor holding his leg. Crying .
Hearing the shouting arnav also came there  and saw that rohan is crying that holding his leg then he asked.

Arnav: what happened why he is crying?

Akash: he slipped from the stairs bhai when he is comming down bhai.

Arnav: take him to hospital then.

Then rohan went to hospital with his bhai.

Then when arnav turned to go then he saw that his doll is standing there with winning look.

Flashback: well when rohan is thinking to take revenge he got an idea that if his doll suffered then arnav will also suffer so thinking of a plan he thought to pour oil on the floor and when khushi slips then arnav will be worried but he don't know is that he is digging his own grave.

Then when he is pouring oil on the steps khushi saw him .after pouring oil he said that
Rohan: so now when khushi comes down she will step on this step and she will fall and her leg will be featured and seeing his doll like that arnav will cry and worry . By saying this he laughed evilly.

Khushi listened that and she thought to do some thing. She smirked internally.

When she is comming downstairs rohan also following  her by seeing from the side of her eyes she thought to implement the plan now rohan is smirking evilly that not knowing he is only falling in his trap . By reaching the step khushi moved aside when rohan is literally behind her and he put his foot on that oil and he slipped from the stairs.

End of flashback
By seeing her  winning look arnav understood that his doll has done some thing  naughty thing.

Why not after she is ASR's  doll. He also smiling internally called his doll.

Arnav: doll what are u thinking come we will go to our room. Said arnav by breaking her thoughts

Khushi: ok. Said and both went from there.

Here is ur next update guys and please vote and comment.