@raltzero the author stopped posting chapters on any websites but shares the story using chat group. The latest chapter is 1790, do you need a text file?
https://www.webnovel.com/book/problematic-little-sister-fell-in-love-with-me_17914730306666605 go read while it is still free.
Sigh I was already past 75... I’ve added it to my library for now, gotta play the waiting game for a bit~