You stare at your altered dong in a combination of disbelief and awe. There are worse things, you tell yourself, than having a gigantic equestrian cock. From the look Gina is shooting you, it looks like she's having similar thoughts.
Then you feel a tingling sensation, not in the shaft of your new cock, but at the base. The tingle soon becomes a terrible itch and you can't help but scratch around it in a futile effort for comfort.
"Oh God, you don't have crabs do you?" Gina asks, clearly disgusted. You try to come up with a clever retort, but your mind is preoccupied with discomfort.
Bloodlessly, your dildo begins to pull away from your groin, flesh stretching like latex.
"No!" you scream as you press down on your dong, trying to prevent its escape. It begins to tug you around the room as it darts randomly in every direction, slowly tearing out of your flesh like it was a cocoon. Finally, with one mighty heave, it rips from your loins and flops to the floor, leaving you screaming in physical and psychological pain.
The burning and itching quickly fade and you notice that there's no scarring or blood on your now featureless groin.
Your dick, now an autonomous Devil's Dong squirms seemingly contendedly on the ground before taking off towards the door as quickly as possible.