I think there must be very few things so powerfully erotic as the slippery twinge on the edge of consiousness that wakes a man to a blowjob already in progress... and well past the point of no return!

 For me, it was with a girl, an architect from SanFrancisco, with whom I had taken up and driven out to the Arizona desert.  In search of lost cities and hidden art. We had marvelous conversations, spiced with frequent bouts of unquenchable lust.

There was a night we checked into a ramshackled motel room containing broken furniature, mis hung southwest paintings, holes in the wall, and a tv that smelled like burning circuits. The evening ended with us, a young well educated couple of good upbringings, fiesting on each other's dirty consuming lusts.

She had on a dog collar.  I leashed her to the broken dresser with a chain, pulled her clothing free, and fucked her up her asshole like the little bitch she was. Cum up her back, running down her sides, dripping from her erect nipple tips onto the stained carpet.  

 In the earliest hours of the morning, I woke with the unmistakable twinge...  I sat to my elbows in time to realize it was already too late... she'd started licking and sucking me some time before and taken me unconsciously beyond the threshold.

It could have been no more unexpectedly erotic if she had strapped me to a table and carried it out...

I helplessly gasped and just let go... let it all go. For her.