Exercise Bike

Susan unstrapped me from the table, untying my feet first, and then my hands. She attached a chain to the collar that had appeared around my neck, and lead me further into her dungeon. I knew better than to resist, even if I was bigger than her. The dungeon was full of sex toys of various sorts, and all type of bondage gear. I'd had a concerning percentage of them used on me. Finally, we got to our destination: an exercise bike.

The bike had two dildos sticking out of the seat, intended for each of my holes, and as Susan brought me to it, I dutifully got on it, sinking down carefully on each of the dildos. My feet slipped onto the pedals, and were strapped in, such that I couldn't get off of it midway through. I adjusted my seating. Honestly, the dildos weren't that bad, I certainly had had larger ones before, especially in here. Putting weight on them while pedaling would intensify the feeling but I was confident I hadn't heard the punchline to this punishment yet.

"Alright then," Susan said, "You are going to ride this bike for a total of 5 miles," on the little dashboard at the front of the exercise bike, a 'miles remaining' number popped up. "Every 3 minutes, the dildos will grow in size, both width and length, but" she saw my eyes widen, "I wouldn't recommend trying to just speed run this. The faster you move, the faster they vibrate. You do not have my permission to cum." I whined at the sound of that.

She walked around me slowly reaching down towards a button on the bottom of the seat. "Oh, and I don't intend to turn this off unless you finish the distance. If you can't keep going, that's your problem, and I'm happy letting you spend the rest of the dream impaled on ever growing dildos."

I couldn't let that one happen. She hit the button, and the dildos started vibrating, and I started pedaling.