Mayfair’s relationship with Kurt is complex. She was his mentor, the boss whose judgement he trusted absolutely until he learned of Operation Daylight. He was her favorite pupil, and she is as proud of him as if he were her own son. They disagree a lot, and they both have a furious temper, but the love and respect they have for one another is profound.
Season 1 Episode 22, If Love a Rebel Death Will Render.