Massive dildo

You pulled out a massive black didlo from the drawer. It was as thick as your fist and was about a meter long.

"Nice choice! A classic. Bring it over."

You followed Snuff's instructions and brought it over, before sticking it to the floor like a plunger. Snuff lowered the girl until just the tip of the didlo touched her bare ass. She then brought a stool and placed it in front of you.

"Here's the game: You stand on the stool while she sucks you. You aren't allowed to move. "

As she was speaking she grabbed a red marker and drew a line in the middle of the didlo.

"Every thirty seconds I will lower her about 5 centimeters. If you reach the goal without cumming, you get a reward and she gets a punishment. If you don't, the opposite happens. The punishment is up to me to decide, and you don't get to refuse."

It sounded risky. You were already hard as a rock, and you weren't sure you could last long enough.