From what I have read, it seems GD Michael and Natalia both actively pursued each other, rather than one serving as primary "seducer." Lisa's point about the inappropriateness of the relationship, because of Wulfert's postition in Michael's regiment, is well taken; Michael, however, had a history of inappropriate relationships before he ever met Natalia Wulfert. His first love was his first cousin, Princess Beatrice (Baby Bee), who was Ducky's youngest sister, then after his family put stop to that, he fell in love with a lady-in-waiting, Alexandra Kossikovskaya (I believe that was her surname), much to his family's horror. After her came Madame Wulfert.
While neither Michael nor Natalia initially acted within the proper boundaries of societal mores regarding their affair, I admire their devotion to each other, which lasted the rest of both of their lives. Their love story, to me, is as every bit compelling as that of Nicholas and Alexandra.
Jane