Hanging out with a monster

I can hardly believe a cock this stupendous wouldn't have appeared yet at MCL, so if this is a repeat, let me know & I'll delete it. Finding it in an old folder yesterday, I decided to share it as is--all 45 minutes!--since copying to abridge it would have degraded the small-format image, and because, even at its full length, it's only 170 MB, & therefore postable that way. It's lovely to gaze upon, whether he's working it or letting it loll about as he types, so I advise you to just go with it. (Sorry, no cumshot.) Most important of all: Does anyone know WHOSE master/monsterpiece this is and where else he/it may be found?