From earlier seasons:
Wrong (http://unhobbityhobbit.livejournal.com/140722.html) by unhobbityhobbit
Dean stands up, nudges the lady who, until recently, was a perfectly happy receptionist at the dentist's just down the street. Until she looked at Sam the wrong way.

This Is It (http://www.fanfiction.net/s/7413548/1/This-Is-It) by Kels92
Dean just wants his little brother back where he belongs: beneath him, screaming his name.

Who's Afraid of the Sun? (http://ficviendha.livejournal.com/105914.html?view=291002) by minviendha
From an ohsam prompt:: Sam has seen Dean torturing demons. I'd really, really like to see something exploring a visceral response to this. On some level, maybe even so deep he's not aware of it, post-6.22!Sam is *freaking out* about Dean. He's scared of him, having physical/emotional reactions that he doesn't even necessarily understand, whenever his brother is around, when he hears his voice, when he sees him with a weapon...all of it. His whole reality, his safe place, is cracked right down to its foundations.

Thanks read the first two but not the last. Most of the old stuff I've read and probably have bookmarked. I was looking for more post season 10 stuff. I'm surprised there wouldn't be a ton. LOL

This might meet your requirements.

http://archiveofourown.org/works/1395259

Thanks I'll check it out.

Hey, I got a story: http://archiveofourown.org/works/3955240
It doesn't quite meet your description in the strictest sense, but it DOES feature Demon!Dean pursuing Sam for nefarious purposes and Sam being in the offer-you-can't-refuse type of hot seat with him. Mind the tags though, please. *g*

This one is really cool.
https://www.fanfiction.net/s/2759281/1/And_Fools_Shine_On
Sam is being stalked - he is torn between helping Dean fight or just keeping them running until something better comes along.

Oooh, that IS cool!

Seems like there were a lot of great Demon!Dean fics, but the ones I remember were after Dean caught Sam.

If you don't mind a self rec, I've got one that might tick some of your boxes:
Where do we begin (the rubble or our sins)? (http://caranfindel.livejournal.com/45677.html)