oh wow! I'm so glad I stumbled across this! I have been searching for Stones slash (though I guess this isn't technically slash, but never mind that!) and had nearly given up hope of finding anything, let alone anything this good. I'm so happy right now! :D

I don't usually go in for fics written in the first person point of view, but this one works really well. You have established a nice, believable voice throughout this and shown us a glimpse of Keith's relationship with Mick. I love this bit:
Keeps playing, and suddenly it hits you-- a fucking lightning bolt from the heavens and electricity running through the veins-- that the old boy's got something there. You grab your guitar. The sun's almost up, and this is why you're alive. - What an excellent way to end the fic! Well done. :D

Now, I wonder have you written any other Stones fics...?!