Amanda walked stealthily downstairs, holding the gun in her left hand. She heard Robert and his sometimes girlfriend, Jess, talking quietly while they alternatively watched music videos, did Robert's homework, marked up their Myspace pages and kissed and snuggled. He had his shirt off, and Jess wore a minimal tube around her considerable chest.

Amanda knew exactly why Robert hung out with Jess. Not only did she have one of the largest busts in the tenth grade, but she never challenged Robert, let him touch her wherever and whenever he wanted, did his homework for him, and generally did all she could to keep him happy even though he spread himself around with other girls too. It was just another example of what bothered Amanda about her brother. He seemed to do whatever he wanted, and he always got away with it.

As she entered the room, Robert had one hand on the remote while the other was inside Jess's tube top, fondling her well-developed right breast, while she held onto his upper arm and kissed him. The television was playing a Kanye West video, and the loud music masked the sound of her footsteps, until Robert unexpectedly turned off the video, declaring it was "old". Amanda's steps now echoed in the room and Robert turned around, concerned about who had just come in to spy on him making out with Jess. Instead, to his shock, he saw Amanda aiming the gun at him.

"Hey, what the fuck are you doing?" he exclaimed.

Startled, Amanda quickly adjusted the gun's settings and fired directly into Robert's chest. "Got you!" she said triumphantly.

Robert was bewildered for a moment. He couldn't believe that his own sister would actually shoot him, no matter how much of a pain she could be. And, indeed he wasn't wounded. What exactly was she doing?

And then he felt it. It seemed that the room was shrinking around him. But no, he was growing. His chest, which had just began to develop, deepened, with real pectoral muscles and cannonball shoulders. His abdominals grew tight and hardened, pulling his stomach inward as a four pack, then six pack and then eight pack became visible. His thighs bulged outward, the cords of muscle thickening and standing out. And best of all, the biceps Jess was holding grew larger, rounder and harder with each passing second, forcing her fingers apart. He flexed experimentally and delightedly saw the ball of muscle, his muscle, expand just like a professional bodybuilder's.

Jess made a little noise of pain, as the expansion of Robert's body and the hardening of his muscles pushed against her much softer and more sensitive body. She watched him flex with amazed admiration, and her heart beat a bit more rapidly.

"Oh no!" Amanda said, fumbling at the controls of the gun. She had obviously gotten the settings wrong. She turned it around, trying to see what she had done wrong, but before she was able to try again, a strong hand had pulled the gun away from her and pushed her away, sending her careening across the room.

"Well, sister dear, what have we here?"