Changing Sister: When I Was Promoted, I Was Outed by My Own Sister.

"Transformation+Loli+Sister+Different World+Dragon+Sisterly Love+"Leisure"" When Cen Lingling woke up, she found that she had become a girl. She had never rested and wanted to be idle for a while. However, she was coaxed by her sister into a different world. She originally just wanted to play for a while, but she found that her soul had changed and was actually related to the legendary dragon... Before finding out the reason, Cen Lingling did not dare to return to the real world at all, and started a new adventure in the fantasy land (another world). It's probably a series of "daily life" after becoming a younger sister. I'm too lazy to think about the introduction for now, so let's just read the text.