In the heart of Metropolis, Roxxie Rocket had successfully pilfered the Lactasa Amulet from the Lactation Luminary's lair. She believed that her newfound acquisition would grant her unimaginable power, but little did she know that the amulet had its quirks.

As she soared through the sky on her trusty rocket, clutching the amulet, Roxxie felt an odd sensation welling up within her. The amulet had started to work its unique magic, and Roxxie's bosom had begun to swell a most unexpected development.

Superman, always vigilant, was patrolling the city when he spotted Roxxie Rocket flying on her rocket with the stolen amulet. He knew he had to intervene before Roxxie could unleash any unforeseen chaos.

Roxxie, noticing Superman's approach, grinned mischievously. "Time to test out this amulet's power," she thought, raising it high.

With a twinkle in her eye, Roxxie activated the Lactasa Amulet's lactation multiplication power, causing her bosom to produce streams of milk that shot toward Superman. The Man of Steel was momentarily caught off guard as the streams of milk collided with his impervious form.

Superman, recovering quickly, gently shook his head to dislodge the milk. "Roxxie, you've got to stop this! There's more to that amulet than you realize!"

Undeterred, Roxxie attempted to use her newfound powers more forcefully. She unleashed an intense barrage of milk projectiles, attempting to immobilize Superman with their surprising force. Superman, however, countered each of the milk-based attacks with ease.

Roxxie grew increasingly frustrated. Her overuse of the amulet was causing her bosom to expand even more, making her rocket ride a bit unwieldy. "What's the matter, Superman? Feeling a little milked out?" she teased.

Superman, struggling to maintain his composure as Roxxie's bosom continued to grow, tried to warn her. "Roxxie, you need to stop using the amulet. It's not what you think!"

Roxxie, capitalizing on Superman's flustered state, smirked. "Oh, Supes, you seem distracted. Maybe I should give you a little closer look." With a sly grin, she used the amulet's power to create milk-based ropes, attempting to ensnare Superman.

The Man of Steel, however, managed to break free from the milk-based restraints. He knew he had to resolve this situation before it spiraled further out of control. "Roxxie, listen to me! You've got to take off that amulet. It's not just a source of power; it's causing unforeseen side effects!"

Roxxie, growing more and more mischievous, decided to push the limits. With a playful wink, she activated the amulet's control over cowgirls. To her surprise, the lactation-driven hypnosis worked on Superman, making him feel euphoric and compliant.

Superman, now under Roxxie's temporary influence, couldn't help but chuckle. "Alright, Roxxie, you win this round. But let's deal with that amulet's side effects and return it to Lactasa."

The two of them shared a laugh as Roxxie, still flustered and sporting her impressively enlarged bosom, carefully removed the amulet. The expansion halted, and the milk production ceased... For now...