A married Upper West Side financial analyst has been accused of flippantly asking for oral sex during an interview with a nanny for his one-year-old daughter. The 27-year-old nanny who asked to go by Dawan told the New York Post that her March 8 meeting with Jason Kuperman, 43, at his West 58th Street apartment left her feeling frightened and violated. Dawan told the outlet that she was alone with the 43-year-old when he took her on a tour of his lavish home – which sold for $297,000 in 2013 – and when they reached the bathroom allegedly made the raunchy request. She claims that while in there Kuperman showed her…