Your now big-breasted girlfriend hits one last button on the machine and then quickly rushes out of the chamber just before the doors slide shut.
The glow from the floor and ceiling grows brighter as the machine hums in to action. You feel a strange tingling sensation spread throughout your whole body. As the humming grows louder, you become aware of the feeling of your clothes moving as if they were shifting against your skin, but the light is so bright, that you have to keep you eyes shut now.
All the while, you feel your raging boner throbbing as you keep picturing your girlfriend's F-cup tits in your mind.
Then, the machine begins to power down. The noise dies away and the lights dim again. You open your eyes to see the doors slid open through a thick mist that drifts out of the machine.
You look down at yourself and gasp in surprise as you see your own penis has apparently grown and is standing rigidly erect in front of you. Its giant head is only inches from your face. To you, it appears to be almost 2 1/2 feet long now.
As astounding a sight as that is, you can't help but notice that your pants are now pooled at your ankles and your T-shirt fits you about as well as a tent.
"How do you like it?" you hear your girlfriend say from above you somewhere. You look up to see her towering over you like a giant. To you, she seems to be over 10 feet tall. A huge grin appears on her face, which is nearly obscured by her giant breasts.
"I-I, uh," you stammer dumbfounded by her enormous beauty. An odd feeling of deja vu overwhelms you. Memories of being a small boy fill your mind as you stare up at her matronly figure. "W-What did you do to me?"
"You see," she says. "I made your body half of its normal size, while, at the same time, I made your penis twice its normal size."
Your mind reels as you try to figure out the math of your change. "So," you say. "That means that I'm 3 feet tall now, and my penis is, um, 14 inches long?"
"That right," she says and smiles. "Good work with the math there, Einstein. I can't tell you how cute it is that you must have measured your penis at some point."
You blush. "Well, I guess all guys do it at least once."
She pulls her shirt off over her head and then unclasps her giant bra, letting loose her titanic breasts. They hang heavily above you, her dark nipples standing erect. You stare at them open-mouthed, nearly drooling.
"How about you 'do it' with me now?" she asks seductively.
You smile and think, this is going to be one hell of a vacation.