Raw: /g/1637085/76ad6535ce/ https://www.pixiv.net/artworks/78424429 https://www.tigoristranslates.com/ was waiting for a long time hoping this would get translated but i guess no one picked it up. i got this translated, enjoy.
I don't think she became a sex slave willingly. She tried to keep quiet out of panic and when Gran was gone they kidnapped her. Her not resisting to that is something that comes with time. The artist was running out of pages in the end to convey it properly.