The Days of Sharing the Body with the Rich Lady

[The title is character setting, and the content is a DND-like novel, that is, Dungeons and Dragons. The chosen prototype is the world of Atas. Lord farming and magic adventure should be considered the main content of the novel] "Want to live? I'll give you a quarter of your life in exchange." She thought it was just a simple symbiosis, but she didn't know that I was a greedy tenant. Normally I watch the show, watching her being chased by a giant desert beast; in times of crisis, I take over the driving and help her fight back in the most hellish way. Cost? I just occasionally used her mouth to say a few dirty words and used her hands to grab some supplies.