Oh, I got a nice idea if you get the chance.
A magical majorette("A female dancer doing a choreographed dance movement with a baton in front of and being accompanied by a marching band") vs a evil conductor. The magical majorette is patrolling the city streets playfully when she hears some distinct sounds coming from a nearby concert hall. She burst in in typical magical girl style only to see girls pleasuring themselves and others, with a woman in a conductors uniform on the stage, seemingly conducting them. She burst towards the conductor who seems to have her eyes closed in a effort to take her off guard, but right when she gets on stage the conductor raises both her hands which causes the nearest girls to rise and grab the majorette. Shocked, she can do nothing as the conductor begins to conduct again, though it seems to be focused just on her. The majorette's eyes begin to follow the conductor's wand and shinny white gloves as they slowly hood and glaze. Then, the conductor finishes by shoving the wand into her head, it magically entering it, causing the majorette to black out. The magical majorette wakes up in her civilian guise along with the other girls, unsure of what just happened, the conductor nowhere in sight. She decides to go back home and sleep on it. However when she falls asleep, she finds herself on the ground, naked, a spot light on her. She sees a shinny pair of white gloves with a wand in them as they begin to conduct, causing the girl to pleasure herself against her will. She finds herself losing the mental struggle and slowly begin to give in, the conductor slowly appearing in the darkness. Finally, the exhausted girl is on the edge of climax, the conductor is fully visible, and she pressing the wand onto her clit, causing her to climax and transform, her body becoming white, black shinny thigh high boots forming on her legs along with shinny long black gloves on her arms, all her facial features being obscured by the whiteness(like a face mask), her hair turning black, a symbol forming on her forehead, and finally dark version of her majorette's cap. The conductor waves her wand and the former heroine rises, she is then given a new baton. The next scene is the girls from the concert hall in classic zombie pose following the now converted heroine, spinning her baton and striking a pose. The finale will be all girls back at the hall, pleasuring themselves and others, the conductor waving her wand about, and the converted heroine kneeling at her feet, using her baton to pleasure herself.
It is rather long isn't it, but I just can't help myself once I get started.
Here are some good band uniform designs for the majorette. As for the conductor, I'd like her uniform to be something like the picture below, a bit more refined, and minus the top hat. I'd also to like for the majorette to have long blond twin tails, but you would be the one making it so change it however you want =)