A cock cage

"Benefit: a cage and key," Luke read, aloud. "What kind of cage?"

Marina giggled and pulled a chastity cage out of her back pocket. "This kind of cage. Jill will decide when you are free, when you are locked, and if you cum. Its a benefit because she can use it to motivate you." She handed the small, metal device, a lock, and a key on a necklace to Jill.

Jill immediately shoved Luke's cock into the tight cage and locked it. She then grabbed his balls and told him, "You will be very lucky to shoot your filth this whole competition. You better fucking earn it."

Luke stood there shaken, while she looked him in the eye. She went back to her line, and he back to his.