I think Viaan as Adnan said in one interview is trying to ease out Katha's tensions in life and thus has started solving her problems even when she clearly tells him not to :P
On episode side, I really liked the episode today, I liked the initial conversation of Viaan with Neerja and their conversation in last scene as well. Neerja finally trusted someone to share her problems with and who better than our hero.
I liked the fact that he is doing it not to impress katha or show her anything, he is doing it genuinely for a person who has helped save Katha's son life.
As everyone I too am liking Viaan's chemistry with everyone more. Even liked the Ehsan-Viaan conversation, it was after very long time two friends sat and sorted their differences, Ehsan was genuinely missing his friend and thus got emotional. Please don't turn him entirely into negative character.