While Quirrell could have asked Harry to help him as a friend, it would have risked Harry balking at any step in the process which involved sufficiently unethical action, at which point Quirrell would have had to pause what he was doing in order to intimidate Harry into compliance (and wait for him to deal with the shock etc.).
Quirrell sometimes makes the mistake of pushing people too much. Perhaps as a consequence of too much cynicism. Harry would probably help Quirrell just because he cares about him... but Quirrell does not understand the concept of "care" and thinks it is only a role that Harry feels obliged to play, which he does not trust as a sufficient motivation to overcome obstacles. So he add further motivation; things that seem sufficiently motivating in his model of Harry.
Two new short chapters! Since the next one is coming tomorrow and we know it'll be short, let's use one thread for both.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 105 (and chapter 106, once it comes out tomorrow). EDIT: based on Alsadius' comment about thread creation for MOR chapters, let's also use this thread for chapter 107 (and future chapters until this nears 500 comments) unless someone objects to doing so. Given that this is the final arc we're talking about, thread titles should be updated to indicate chapters covered.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: