Lauren's dancing and feeling the heat

Lauren danced wildly for hours. Her companions noticed, and got a great deal of amusement watching her flail about. For one thing, nobody had ever seen Lauren dance before. She was normally far too serious for that. For another, Lauren was a very poor dancer. It wasn't just the ecstasy, she was just a bit spastic and clumsy. Still, with no inhibition she danced wildly about until she was pouring sweat.

God it was hot here, Lauren thought from the crowd. She just felt so hot... and good... especially between her thighs and her breasts. Ooh, she'd never felt like this! Totally thoughtlessly, Lauren reached down and grasped the hem of her shirt. Charlotte and the others burst out laughing as Lauren slipped it off over her head and threw it aside without a care in the world! Lauren then continued to dance shirtless. She wore a thick, bulky black bra that contained her heaving, D cup breasts. Charlotte felt a twinge of jealously, noticing all the attention Lauren's large breasts were getting. Then Charlotte noticed something else.

"Hey, what's that around Lauren's waist?"

She pointed at the strange band of fabric around Lauren's tight stomach. It descended down into her pants. What could that be?