Amelia Bailey Blunt: gamer, blues enthusiast, degenerate. About to play a blues gig on a Friday night she was transported into a dying world by a mysterious spell that calls itself 'The Nullshade System.' Given powers to manipulate her body, respawn and others she will discover, she is thrown into a world locked in the throes of death.

NSFW warning.
The protagonist is a degenerate, but she will also get work done in the story.
This book is NOT paywalled.

Rating for content in chapters:
♥ - probably kissing, touching, teasing, etc
♥♥ - quickies, etc
♥♥♥ - explicit