Deciding to save the tiny speck in her hand for some fun later, Hannah shoved Jenna down her bra cup, right to her left nipple, so she could feel Jenna squirming around her breast. She then had a short giggle, shaking her breasts and causing the shrunken guy in her cleavage to get buried even deeper in her cleavage, making breathing an even more strenuous act.
Putting two and two together, she took the gun and studied it. She learned how to control the device, and even found a function to grow specific body parts on people. She decided to test it out and headed back to the class she came from. When she got to the doorway, she shrunk the professor and walked in, aiming the gun at the students. They panicked as she walked in, stepping on the professor with a satisfying crunch, leaving a red puddle under her boot. A few students got up and tried to run, but she quickly shrank them down, freezing the other students in their place.
"all right everybody, listen up: if you don't want to end up like the teacher hear, you'll do exactly as I say", Hanna told them. "We're going to do some experiments today, so pair up, boys get with girls, come on now", she ordered them. They obeyed, though there was one pair of girls and another lone girl at the end. Noticing the lone girl, Hannah, sighed, "I guess today is just not your lucky day", and then shrunk her. She ordered the pair of girls to pick her up. Hannah then shrunk all the students down to an inch tall, then went around and picked up the pairs, and placed them all on separate desks for her fun.
She found the pair with the slutty cheerleader that pissed Hannah off to no end. "Hey, guess what you slut?", Hannah beamed down, "Today is going to be one dick too many for you!" Hannah laughed, then aimed the size ray at the male, and started to grow his dick. It soon became larger than him, and the cheerleader could only stare in awe. Soon it was over two feet long and four inches in diameter. Hannah then began stroking the dick, and it didn't take long before he came, burying the cheerleader under an ocean of semen. She then lifted the dick up, and slammed it down on her, crushing her flat, which caused the dick to rebound, and then fall on top its owner, crushing his upper body.
Hannah went from table to table, trying out different combinations of body growth and further shrinking. Some guys got engulfed in growing ass cheeks of the girls, some were crushed under giant lips, and others were lost in an expanding cleavage that overtook them and crushed them. Some body parts did not respond well to growth, which resulted in a few exploding heads. Hannah rounded up the few survivors as she went along, stuffing them down her bra. She eventually got to the pair of girls with the even further shrunk girl, and told them to hold the further shrunken one between their breasts. She then went to the doorway of the room, aimed the size ray at them, and set the breast growth to the maximum setting. She shot both girls and took off. The girls breasts grew quickly, crushing the tine girl between them, and they soon filled up the room completely, crushing desks, and the few shrunken students disregarded by Hannah on the floor, before slowing and stopping.