It had taken some convincing to get your girlfriend to go the adult bookstore, but when she showed curiosity in the booths in the back of the store you figured you'd hit the jackpot. As you changed a $10 for singles and led her back into the dark hallway you envisioned her on her knees sucking your dick.
And, at first, it seemed a likely result. At least until the unnoticed glory hole in the wall suddenly filled with a huge, black cock. It brushed her arm and she looked down and gasped at the thick, 8 inch shaft that hung there, throbbing. Before you could say anything, her hand slowly wrapped around it and began to caress it. You were in awe as you watched, unable to bring yourself to stop what was happening.
You watched in light headed, amazement as she knelt. Your own dick almost painfully hard as your proper, upright girlfriend slid her mouth over the anonymous cock and began to suck. A moment later, as you stroked your aching dick, you watched as a second black cock slid into view, and soon into her mouth as well.
It wasn't long before nature took over and she answered the call of her drooling pussy. Bending over and pushing back to impale her tight, white hole on those pulsing cocks. Her eyes closed, feeling each and every vein as her body was stretched open to accommodate their girth.
You couldn't stop her because you didn't want to. You didn't want to because you never realized how much it would turn you on to watch the woman you loved, give her mouth and pussy to anonymous black cock. Seeing the lust in her eyes as her body was ravaged and hearing the whimpers as she was made to cum over and over and over . . .