A Butt Plug

The clear glass object was heavy in Sue Storm's hand. Not huge. About the size and shape of a hen's egg, with a flared base like a mushroom cap. Nissa handed it to her with a small bottle of clear, water-based lubricant.

"How is a butt plug going to make me a better dancer?" the Invisible Woman asked.

It wasn't an immediate rejection. Just an honest question.

"One, it's a nice surprise for the audience," Nissa said. She held up her hand and counted off her fingers. "Two, it makes you more conscious and aware of your body. Three, it acclimates you to distraction. If you can dance with a plug in, you can dance while dodging beer bottles or wearing pasties and a strap-on, or ripped off your tits on cocaine. Four, it helps train your ass. Nice little bonus for sexy times with your husband, eh?"

Sue Storm looked dubious. Nissa still had one finger up.

"And five?" the naked heroine asked.

"Because it's fun," Nissa said. She turned around and bared her own ass. Sue felt a sudden tightness in her chest as she saw a black circle nestled between those plump cheeks.

The Invisible Woman considered that. Then she stepped into the bathroom. It sounded so simple. Lube on plug, plug in the hole. Yet the experience of it was different. The hard, rounded tip pressed against her sensitive little hole. Sue was on her toes, knees slightly bent, reaching behind her and applying steadily more pressure.

"Just relax!" Nissa said from the doorway. "Don't try to **** it. Don't hurt yourself. Use more lube if you have to."

Sue's eyes teared up as her pert pucker slowly **** itself open. It burned, a little. Then, as it passed the widest point, it almost seemed to sink in. The Invisible Woman gasped as her sphincter clenched around the neck of the plug, the base preventing it from moving any deeper inside of her.

It was different than Sue expected. A small weight, but a constant presence. Demanding attention. Not painful, but...there. Something she couldn't ignore.

"Now," Nissa said. "Come out and dance!"