I have a feeling that Virat will say he loves Sai in the midst of an argument with her so will say it in a fit of rage. That will Sai shocked as this would have been something that she didn't and doesnt expect to happen.
I can see when an argument is getting really heated and Virat on the spur of the moment will say 'Because I only love you Sai and no one else'.
His first confession will be the confession that happens unexpectedly.
Thoughts?