Belle asked her twin sister: "So, sis, any idea ? What kind of superheroine you want to be ?"
" Someone who can complete the team. Maybe something that is related to technology."
Belle used here eyebeam on her tin sister. The transformation was way more subtile than all the others. Her hair became shorter, her boobs shrank down to a A-cup. With her baggy black Tshirt, her apparently cheap Jeans, it was hard to tell if she was a boy or a girl. It was even harder to guess she was a genius inventor, and maybe the richest person on Earth as well as the smartest.
Reality was adjusted, and their modest home became a luxurious 4-story building, large enough so than 20 personn can live there, with a private laboratory/automated factory in the basement, a large swimming pool outside, and everything they need.
The newest superheroine kissed Belle and said: "Perfect ! By the way, my name is Sparks, now."
Belle smiled to Sparks and declared: "Our Team is finally complete ! We are the Seven Sisters, the greatest superheroine team/family in the world !"
It was just in time, because on TV there was a special anouncement. Something terrible just happened, and the new superheroines could make the difference. It was ....