Cosmo's Baby Sister//Sonic X//OC Insert
  • Reads 181
  • Votes 2
  • Parts 1
  • Time 16m
  • Reads 181
  • Votes 2
  • Parts 1
  • Time 16m
Ongoing, First published Dec 12, 2024
Corinne the Seedrian is a special little girl, and her big sister, Cosmo, cherishes her from the very moment she was born.
She took care of her with the help of their oldest sister, Galaxina.

Little Corinne learned so much so fast as she grew. She is a smart baby! She loves her big sisters a lot, even giving them nicknames. She calls Galaxina "Big Sissy", and she just calls Cosmo "Sissy".

She was scared when the Metarex came and destroyed their home. She was heartbroken seeing her family get taken out... She and Cosmo were the only survives, and Cosmo was terrified, yet determined to keep her little sister safe and away from the Metarex.

They managed to escape inside an escape pod, and now their mission was to find a very special hedgehog to help them.

They end up crashing inside a planet where they think the hedgehog lives. Cosmo was able to prevent Corinne from getting hurt, only for her to end up passing out instead.
They managed to be found and taken care of, and they finally get to meet the mobian they were looking for in person. Sonic The Hedgehog!

With his and his friends' help, will they be able to defeat the Metarex and save the galaxy? You'll have to find out along their adventure! Oh~! And expect some romance happen between Cosmo and a certain genius two-tailed fox~!


((Sonic X does not belong to me, only my OC does! Enjoy! ^^))
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