Both Eden as a whole and Eve in particular are not afraid to use the fanservice in all its manifestations. A lot of merch, relationship with fans and, of course, the desire to please the target audience. Most of their fans are young girls who like to look at pretty boys.
That's why their concerts are often replete with quite... interesting dances.
Jun has never liked the idea, but he doesn't really have a choice. Hiyori constantly pisses him off and embarrasses him, so being his partner is a living hell. Trying to come to terms with this, Jun decides to practice dancing while there is some time. Feeling safe alone, he relaxes and begins to dance more confidently, enjoying how smoothly his body moves... not noticing that he's not really all alone.
Miss Producer stands in the doorway and watches him, not moving or making a sound, not wanting to interrupt him.