It's worth noting that this look in Ak's eyes is not a look of awkwardness 
This is how you look when you are lost in someone's eyes, not when you are awkward with them. 
They only got awkward after they snapped out of the moment

So I'm not sure what Muskaan's point about awkwardness was....that Ak isn't ready for intimacy in this marriage? Bhai going by her expression here where she was LOST in Abhimanyu, that presumption doesn't bare out
Only thing she is awkward about is having feelings for Abhimanyu still....not that she doesn't feel anything and that is why the awkwardness 
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