These are my favourite fuck-or-die fics:

But What a Lovely Way To Burn (http://lazy-daze.livejournal.com/600762.html) by lazy_daze
An Issue of Consent (http://varkelton.livejournal.com/11848.html) by varkelton.
Like a Fever Burning Faster (http://teashopmuses.livejournal.com/28612.html) by selecasharp.
Don't Forget to Breathe Tonight (http://jeyhawk-fic.livejournal.com/48171.html) by jeyhawk.
Better That We Break (http://blue-soaring.insanejournal.com/4241.html) by blue_soaring.
Knot a Net to Make the Moon Rise (http://locknkey.livejournal.com/114378.html) by locknkey.
Unicorn Hunters (http://aggybird.livejournal.com/123516.html) by aggybird.
Top This (http://archiveofourown.org/works/181717?view_adult=true) by leonidaslion.
The Look on Your Face Yanks my Neck on the Chain (http://littlesleepfic.livejournal.com/9129.html) by onelittlesleep.
Some Kind of Strange Magic (http://lustmordred.livejournal.com/43991.html) by lustmordred.
Consequentiality (http://archiveofourown.org/works/227024?view_adult=true) by kerfuffling.

Some possessive!Sam:
Between Shooting Stars and Satellites (http://toxica-fic.livejournal.com/11043.html) by toxica_fic.
Nothing to Lose (http://concernedlily.livejournal.com/56628.html) by concernedlily.

And here (http://www.diigo.com/user/kali0712/pretend!couple%20first-time) are the first-time pretend couple fics that I've bookmarked, they're all good.