Something even smaller...

A moment later, Rachel's hand slipped around the curtain, holding out a skimpy thong swimsuit. "John," she called out, her voice a little too casual. "Could you try these on?"

John stared at the scrap of material in disbelief. "A thong?" he squeaked. Rachel's laugh was light and airy, almost a giggle.

"I know it's not what you're used to, but they're very popular right now," she said, her voice teasing. "They're supposed to be very comfortable."

John took the thong with trembling hands, his cock still at full mast. He stepped into it, the fabric barely covering his balls before it stretched taut up the length of his shaft. He stepped out of the changing room, feeling more exposed than he ever had in his life.

The moment Rachel saw him, her eyes danced with mischief as she took in the sight of his thick, veiny cock straining against the fabric. "Oh my," she said, barely keeping a straight face. "It's definitely...snug."

John felt his cheeks burn as Rachel stepped closer. She bent over slightly, her breasts brushing against his bulge as she checked the side of the thong. He was mortified, but Rachel seemed unfazed. "Let's make sure it's not cutting off your circulation," she said, her voice light and teasing.

Her hand reached out to adjust the side of the thong, her fingertips grazing his inner thigh. John felt his cock throb, the fabric of the suit barely containing his arousal. Rachel's breasts swayed as she moved, and he couldn't help but stare. She had to have noticed, but she continued to act as if nothing was out of the ordinary.

"John," Rachel said, her voice a gentle chastisement. "You're blushing. It's just a swimsuit, and it looks good on you."

John nodded, trying to convince himself that she was right. But it wasn't just any swimsuit, and Rachel wasn't just any saleswoman. Her touch had sent shivers down his spine, and he couldn't help but feel like she was enjoying this way too much. He took a deep breath and stepped closer to the mirror, trying to ignore the way his cock was straining against the flimsy material.

"Here, let's go to the good mirrors," Rachel suggested, her eyes glinting with something he couldn't quite read. "The lighting is better there, and there are multiple mirrors where you'll be able to see how the swimsuit looks from every angle."

John's heart sank. The last place he wanted to be, surrounded by more mirrors and brighter lights. But Rachel was already leading the way, her hips swaying with an easy confidence that made his knees wobble. He felt he had **** but to follow, his cheeks burning with embarrassment.

As they reached the center of the store, Rachel stopped and turned to face him. "Now, let's see," she said, her voice a purr. "Turn around."

John slowly turned, his eyes scanning the room. There were a few other shoppers, but they all seemed to be conveniently looking elsewhere. Rachel stepped closer, her eyes raking over his bulge.

"Well, what do you think?" Rachel asked, her voice a little too casual.

John's eyes darted to the floor, trying to avoid the reflection of his own mortification. "It's... uh... a little too revealing in the back," he murmured, his face on fire.

Rachel stepped closer, her eyes twinkling. "Let me take a look," she said, her voice a playful purr. She leaned down past his hips instead of walking around him, her ample cleavage spilling out of her top as she pretended to inspect the back of the thong. Her breasts hung low, and John couldn't help but stare as she bent over, her ass in full view right in front of him. It was round and firm, and the way her leggings clung to her curves was mesmerizing. Rachel's hand reached back, her fingers grazing the fabric of the thong as she tugged it into place. Rachel gave one more slight tug, to make sure John was more covered in the back.

"Is that better?" Rachel asked.

It was not better. With that final tug, John's entire cock had popped out of the front of the thong. Rachel was still looking the other direction at the back of the thong and didn't notice.

John felt his cheeks burn and his stomach drop as he realized that he was fully exposed. He looked around the store and noticed that a small crowd had gathered, some whispering and pointing, others openly staring. His eyes locked onto a young woman with a phone, her camera lens unabashedly trained on his crotch. Rachel's ass was right there, so close to his exposed cock, it was all too much to handle.

With a sound that was half-gasp, half-moan, John felt his body betray him. He came, the first spurt of cum shooting high and landing on Rachel's ass, the second hitting the mirror with a wet smack. Rachel's eyes went wide as she realized what was happening, but she was too stunned to move. John couldn't stop cumming, and he kept shooting out more and more cum. More landed on Rachel's ass, painting her leggins. It was like the world was in slow motion as John watched the crowd's shocked expression as he came harder than he ever had in his life. By the time he was done, there was cum everywhere, on Rachel, the mirror, the floor, and all over the swimsuit.

The crowd's reaction was a mix of shock and amusement. Some gasped, others laughed, and the girl with the phone didn't miss a beat, recording every moment. Rachel jumped back to stare at him with disbelief.

John's eyes darted from Rachel to the crowd and back again. He was frozen, unable to speak, his body still pulsing with the aftershocks of his orgasm.

The crowd had gone quiet, watching the scene unfold with a mix of shock and amusement. The girl with the phone had stopped recording and was now openly laughing, showing the video to her friends. Rachel's face was a mask of horror, her eyes flicking from the cum on her body to the phone and back to John's still-hard cock.