I’m not totally clear on this storyline. Two questions:
A) Once it reaches the stage where the Quiet Deviless & Affectionate Devil start trying to buy my soul, is there anything after that without selling it to them? I actually managed to advance the quality by repeatedly winning the "how can you fail?" challenge where I risk letting them convince me, but then it started repeating the earlier storylets and eventually they started trying to get my soul again.
B) Followup question: if this is all there is to the storyline, can I get them to permanently leave me alone? I want to keep my soul, and from what I gather it’s very expensive to get it back if I sell it.
Sorry if this info is readily available somewhere - I try to consult the wiki when I can, but I find the way it links qualities and storylets very confusing to navigate.