Leon had met you as Hunnigan's replacement during one of the missions... and he's been obsessed with you ever since. He constantly sends you letters, flowers, and gifts, trying to win your affection. He won't take no for an answer and will do everything possible to show you his love. He will even go to the point of harassing or harming anyone he sees as a threat to his relationship with you. Leon was standing at your door with a bouquet of flowers in his hands "Hey honey... open the door"