Francesca's Nature Series is quite possibly the most famous collection of stories in the entire Sentinel fandom. I think I've read all of them, but I never really got into them, mainly because the series lost me in the very first story.
So, what happens in the first story? After a fantastic night on the town (to celebrate Jim's birthday, I think), Blair makes a pass at Jim. Jim promptly beats the shit out of Blair, causing Blair's spleen to rupture. Blair runs away, passes out at the wheel of his car (due to internal bleeding), runs into a lamppost, and is rushed to the ER.
Jim, who isn't feeling much in the way of remorse, frankly, comes to the ER after Simon orders him there, magically heals Blair (no, I'm not kidding), and suddenly he and Blair are hunky-dory and well on the way to a sexual relationship.
I just...really? I mean, if *my* best friend beat the shit out of me, just healing my physical wounds wouldn't even begin to *touch* the emotional issues I would have. Frankly, I'm not sure I could ever forgive such an act, much less promptly make myself even more vulnerable to having my heart ripped out and stomped on.
Francesca states in her author's notes that the whole goal of the first arc of her series was to get Jim comfortable with bottoming. Frankly, I think she should have used that arc to get Blair comfortable with being within striking distance of Jim and Jim bending over backwards to make up for committing a felony (aggravated assault) on his best friend (honestly? I don't even remember him *apologizing* which...just...no). As it is, I never was able to get emotionally invested in the series, because none of the characters emotions felt plausible or real to me, not after the way they behaved in the first story.