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Requested by Tiarastwilight, who asked for

"So for the story behind this is that Star Butterfly was looking for a way to get inside Janna's head and prank her with some magic latex-paint to form a costume and go around pretending to be her. However she miscast and the spell had her BECOME Janna, coating and oozing her with gooey rubber paint! Of course Star cannot complain with the results, she's a perfect copy of the mischievous delinquent student afterall. With her wand, paint and magical dark arts Star ends up an obedient clone and slick rubber clone of Janna herself. However she didn't anticipate Janna finding her out, nor how much she'd enjoy it and the changes it offers.

For the picture itself, Star is mostly painted as Janna, she's tugging on the spreading Janna-goo however (see slimy ref). Janna is talking to her offscreen about her decision to become Janna, shocked and abit confused but Star strangely saying she doesn't mind this, she always thought Janna was cool afterall and this is just a side-effect of her funny prank. Janna bewildered, is hearing that she. LIKES being her clone and did this to herself? Star seems to agree, even as her personality and mind start changing to Janna's, turning from enthusiasm to to confusion, afterall she shares everything Janna thinks now including her perspective. The two at the end realize Janna has completely replaced Star in body and mind, and the two talk about hanging out or going spraypainting, something troublemakingly Janna-like and fun. The new Rubber Janna also calls Star kinda silly for this whole situation.

Refs: [ref]"