It has been years, but there used to be a bookstore called Crazy Charlie's that I went in a few times. When I went in once the place was slow with just a black guy talking to the clerk. After maybe 30 minutes of hanging in a booth a guy went in the other side and in just a few seconds slid a kinda thin 7 inch cock with a big head thru the gloryhole. I dove on it and sucked like the cum-hungry slut I was. After maybe 5 minutes he moaned, then shot a sticky load in my mouth which I swallowed right down.
I knew the place was empty otherwise, so I decided to head out. As I was I glanced over at the clerk and he nodded his head at me. Suddenly it hit me that I never heard anyone come in before I sucked the gloryhole cock and never heard anyone leave after, and I realized I had sucked off the clerk. Sadly the place closed a few years ago and I never got to go back.