Transformed into a Magical Girl, but I Only Use Tentacle Magic

[Magical Girl] + [No Romance] + [Plot-Driven] + [Multiple Identities]
As the former top magical girl of the Moonlight Rank, Mandrake became a wanted fugitive of the Magical Court after being forced to kill a teammate during a mission.
Corrupted by the incident, most of her magic was rendered useless—leaving her with only an improper and indecent form of tentacle magic.
To evade capture, Nan Yuli abandoned her identity as a magical girl, blending completely into the mundane world of ordinary people.
That is, until one day, her little sister suddenly announced her dream of becoming a magical girl—and, to Nan Yuli’s horror, seemed to be making real progress toward that goal.
At that moment, Nan Yuli panicked.
—Your big brother here is the Magical Court’s number one fugitive! If you become a magical girl, they’re going to dig into my past and expose me! What am I supposed to do?!
—And why, at your age, are you so determined to pursue this career path?
—As someone who’s been through it, let me tell you—it’s not great.
—What? You’re saying you only listen to Sister Mandrake?
—I f**king…
Thanks to her sister’s relentless efforts, Nan Yuli’s true identity was finally exposed.
Cornered by former comrades and old friends, the sly and cunning girl could only put on a weak and helpless expression.
“You… What do you want? D-Don’t touch my tent**les!”