Torn from blood

Takahashi Shirogane (more commanly known as Shiro) Has a little sister that means the world to him. Her name is Reanalina Shirogane (Reana) and she was heartbroken at the news of her brother's disappearance and possable death on the Kerberos mission, so she decided to explore for herself. She snuck onto a ship and went into space. She had built gear to help her search, so she put it on and began her search. After 2 days in space with no food or water, her air ran out and she was captured by the galra. Finally reunited with her brother Reana feels happy, but then Shiro escaped. She wasn't able to, but she helped him in every way she could. She was punished and finally taken to be experamented on. Shiro never forgot his sister, and one day told the voltron crew. They went searching for his sister, but it might be to late.