He begins to enlarge parts of your body

The electric tingling that courses through your body intensifies and seems to gather in your breasts. You begin to feel a burning sensation. You look down and, to your horror, you watch as your little nipples atop your perky tits begin to grow. First they get longer, stretching out more than an inch from your chest, then they begin to grow thicker and thicker until they look cartoonishly huge attached to your pert, youthful breasts. The burning sensation pours from the roots of your nipples to your areolae which, widen like stains, darkening your flesh until they almost completely cover your breasts.

"What are you doing to me?" you cry.

"Just making you better," says Frankenstein. "Now be still, this part might hurt a bit more."

"You're insane I-Hnnnnnn!" Your words are interrupted by searing pain in your chest as your breasts begin to grow. Through the tears falling from your eyes you watch in horror as they bulge outwards like cannonballs. They are as big as Winny's. Then bigger, as large as Headmistress Swift's huge tits hanging from the monstrous creation propped up across from you. But they are still growing, swelling to match the huge nipples, swelling until their inside curves press together tightly. They are light at first, but you can feel weight shifting into them as if the mist you are inhaling is providing the raw material being pumped into them.

You are sure you are about to pass out from pain when it suddenly stops. You look down and realize that you are now sporting at least double F-cups. Maybe bigger, into cup sizes no other girl at Paisley even approached. Your nipples are twice as big around as your thumb. Attached to your slender frame it all seems so ridiculous, but then you realize Frankenstein isn't done with you. The electric pain moves lower, broadening your hips with burning jolts and enlarging your ass until it feels enormous.

"Please," you beg. "Don't do this."

"Just one more thing, my dear," laughs Frankenstein as he walks up to the cylinder. "If I am going to use your lovely new body for my purposes I require a certain appartus you do not come equipped with."

The electricity shifts and dials in on your clit. Your eyes bulge as you realize what he might mean.

"No! You can't do this! Please. I'll do anything!"

"Yes, when I am in control of your body!"

"Please, Professor!" The burning starts and your clit begins to slowly enlarge. "Please! I will...do anything you want! Just don't do this to me!"

Professor Frankenstein looks up at you and smiles as the electricity begins to enlarge your clit.

"And just what do you have to offer me?"