Kinktober 2018 Redraw - 02-Electric

Of all the events at the Bondage Games, the marathon was considered the most gruelling. Erin prided herself on her fitness, which was why she had decided sign up and test herself. Two hours in, sweat was pouring off her body, as she drooled around the hard plastic ball in her mouth.
The collar acted as a tracker and motivational device, ensuring competitors stayed on track and maintained a minimum pace between checkpoints.
An artificial voice came through her earbuds. 
"Speed unsatisfactory. Administering motivation."
She accelerated, but was too late. She yelped as her collar beeped and then gave her a small shock.