@Starsign..as you said earlier ,they are emotionally attached to each other ,maybe that has given them an upper hand and rights over each other ...param is indeed short tempered but with her ,he lets her get away with everything and yes the way they keep on stressing on that permanent thing with gesture...and for her annoying habits ,she does genuinely care for him and that has touched him on an emotional level..
when the show extension cancel news was revealed to the cast,she had an off ,she came specially for him and stayed with him through out the time he was on sets shooting and he shares even the smallest of things with her
She really cares for him...that is there for everyone to see.And I cant label that care except it's very deep and genuine