Feverish and alone, a young man explores his body's limits with a chilled thermometer. He tentatively pushes the cold glass tip against his urethral opening, shivering at the contrast of temperatures. Slowly, he inches the thermometer deeper, gasping as it touches his prostate. His cock hardens, standing proud against his taut stomach. He pauses, feeling the cool object fill him, before resuming his exploration, pushing it deeper still until it's fully buried.