I had a thought when I saw the Holika dahan. Most of us believe that Vinu has a certain image of Sai that he loves and idolises. It is P's story together with the reveal that has made the child go into that cocoon.
But what I'm noticing is, the "happy family" that he always wanted. His Baba, and his sister that he loves. And the figure of "Aai" that has pictured in his heart. He is seeing them together and he wants to be a part of them. His version of the ideal "Happy Family". He is tempted.
This was the case when Savi sent her the pics from dinner and the same when they were taking the parikrama. He is watching it. And is getting lured. But P's words are holding him back. The fact that Sai can do magic and now she has his baba under her spell and she can do the same to him. So he is scared.
The boy is in a dilemma. He does not want to hurt his mother. The one who should be ideally looking after the son, is using him to vent out her own sob story and gaining his sympathy.
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