well its already seen that shashank is totally flat over prateeksha....he is deeply in love with prateeksha which he will realise soon....now for your question how prateeksha will fall for shashank?...well right now she respect shashank because he is her boss and all and today with the care and concern shashank gave to her she was floored and had a little feelings for him so the day its not far where she too will fall in love with him because of his changed attitute....care and concern for her and of course his eyes which only shows love and passion for her to all limits and extend......
but what i am really afraid off is prateeksha will not accept shashank's love even though she loves him deeply because of aaraina-sumo connection and this will really shatter shashank's heart and feelings for her...shashank by heart and soul is very emotional he will break down if prateeksha doesn't accepts his love and breaks his heart....there is alot before PraSha gets together...there are alot of pyaar ke dushmans surrounded by PraSha....they will sacrifice alot but still keeps on loving each other passionately and madly......
as for confession i am real sure shashank will confess his love to prateeksha first either on Shashank-Sumo marriage day or Prateeksha-Prashant marriage day