Everyone involved is pretending not to try, which is of course the most strenuous kind of trying there is. The signals stay deniable, the tone stays light, and beneath the studied indifference the pulse is doing something else entirely.
It is a duel of composure. Whoever admits to caring first loses a round, so the whole thing proceeds in coded asides and plausible deniability, sincere feeling smuggled inside a joke that can always be disowned.
The music carries the same arch, deadpan swagger. Cool, knowing, a little detached, it keeps a straight face over a groove that gives the game away, all raised eyebrow and steady hips.
The series pauses here for something wry and played with a straight face. Put it on when you want to flirt with the flirting itself and enjoy the performance as much as the prize.