Benedict and Tessa in the studio, at the Royal Academy of Art. From Season 2 Episode 5 - "An Unthinkable Fate".
As much I don't want to think about Benedict with anyone other than Sophie, I love this scene on so many different levels:
Story & dialogue: The introduction of Tessa is so smooth. The way they meet flows so naturally and is immediately electric. No lengthy exposition or barrage of details thrown in your face. Excellent acting and story telling.
Music: The playful seduction picks up through the music playing in the background - the gentle plucking of string instruments gives it such a fun, bouncy atmosphere.
Lighting: The contrast of hard and soft lights in the room, enhancing the mood. Particularly this shot where the hard light highlights and creates shadows on Benedict's face, creating that emotional connection to the moment, ugh! So good!
How they managed to fit so much goodness into a 2 minute scene is mind-blowing!
Side-note: And yes, I liked it so much that I've used it for my new avatar :)