I can also go further and ask all doubters to check Naavya and MB farewell videos, Shah was doing so much masti with everyone because it was literally the last time he would get to do it... Check out Shah with Sowmya wala video on their last day shoot... That was very very different compared to his eqn with Eri.. He didn't bid farewell to Eri at all in comparison
Also I notice that Shah is very cool with clicking pics with any random female, most of them cling on to him.. Only with Eri there is a guarded distance, she too never clings.. Dont know if this is good or bad, but this is enough to say these two are not just casual buddies... There is nothing casual about them anymore actually... After those BCL pics of them, I havent seen anything casual from these two