First accident! Misty's breasts grow outward

"OK, now let's switch to our next position, the Lotus." Evan said. Everyone did what he said. As Misty sat, though, she continued to feel like her bikini top was tighter. Taking a quick glance down, she did notice that they seemed a bit bigger.

'The hell?' Misty thought. 'My boobs grew? When? Oh, I must have finally digested that Milky Delight and my body's distributing the weight. I can work it off later.'

Misty pushed the thought aside for now and tried to relax herself. However, she failed to realize that, as her breasts slowly swelled, her bikini top was starting to come undone.

"Alright, for now, it's time for the final position: the Cobra Pose." Evan said as he began to reposition himself.

Everyone once again did the same. But as Misty began to stretch, she felt something on her back: the little knot keeping her bikini top in place was beginning to unravel. Quickly, she squeezed her uppers arms tightly to her sides to keep the straps from falling. Excusing herself from the session early, Misty quickly left the session and raced for a bathroom, arms still awkwardly pinned at her side.

Finding and entering the women's restroom, Misty took a look in the mirror. To her surprise, her boobs had grown to about a F-cup in just an hour. Previously, they had been B-cups. But not only that, it looked like they were still gently swelling.

"What the? How the hell did I gain two cup sizes in one hour? And why are they still growing?" Misty asked, totally baffled. She managed to re-tie her bikini top somewhat, though it was still getting tighter. She left the bathroom, hoping to get back to her hotel room before anyone saw. That almost immediately failed.

"Hey, are you alright?" A voice asked behind Misty. Turning, she saw...