Sam
I'm not strong enough. I'm not. Something would go wrong and if he had it it'd be way too tempting, he told you that himself more or less.
I'm not a crossroads demon and even with that power you actually think I'm anywhere near Azazel's level? Not even close Sam. I know the power he had, you could sense it just being around him, Crowley has it too. I'm just...the help.
Even if I could though, I'd say no. You're treating your soul like a bargining chip and it stops now.