Very good

Miss Foster blushed a little before leaving the room. It was obvious that she left the class in the hands of a professional. Vivian by comparison quickly stripped off her uniform, her elfin form surprisingly busty for her size. She moved over with speed, unashamed of her nakedness and without any hesitation unzipped the new teacher's pants. John was surprised how the relatively small and lithe girl happily squeezed on his balls, gently massaging him as her inexperienced but eager lips wrapped around his shaft. John groaned placing a hand on her head it felt amazing to have a teenage girl happily sucking him off as the other members of the class watched her go. He couldn't help himself he grasped her hair, burying his hands in her long hair. He'd have to get her in twintails later, she was too good to give up. He might just keep this nerdling for himself.

Snap

Still he couldn't resist a little change to the girl gleefully drinking his pre lapping at his cock. He watched with satisfaction as the girl's bust began to swell and grow, each suck making it bigger on her chest.

"As you can see, pleasing a professional like causes rapid changes in a person's body. If you boys work on your technique you can make any girl your ideal type." he added snapping his fingers to make it true as the naked teenager stuffed her face with his cock. Her hips swelled up and her rear filled out as he watched the class getting hot and bothered.

"OK boys time for some practical, pick a girl and pair up anyone who doesn't get picked by a boy, pair up with another girl," he instructed grinning a bit as he watched their expressions change.

"Do we have to?" asked a cute busty redhead who had 2 sets of male eyes on her.