The needles sink into your chest, and you feel your nipples perking up, suddenly becoming ultra sensitive to the air around them, swelling. You could see your chest expanding, rounding, small, perky A cups forming, then rounding into breasts that have weight and substance on your chest. They keep growing, swelling, rounding upwards over minutes, all the while pulsing with new sensations of pleasure and nerve endings you didn't know you had tingling with delight.
Your sense of time is starting to fade with the amount of sensations you are experiencing all at once. Soon your breasts are huge, spherical, and just barely wieldy, bigger than you'd ever dreamed of growing, and sensitive all over. The machines swivel in, seize the nipples, and with an audible *t-chunk*, pierce them with barbells. This time it hurts, and you moan against the cock deep in your throat.
The scene in front of you plays out without interest in your plight as the machines drift ever downwards.