Sue pressed the trigger, and felt enjoyment on watching her brother's pride disappear.
Soon, Sue's brother's muscles retracted into himself. His clothes felt a bit loose, but he didn't acknowledge it as important.
Suddenly, his once tight pecs swelled up into round, soft mounds, and his stomach grew. He obtained love handles, and they spread all around his now tight pants.
Naturally, he started to panic as his arms rounded and became pudgy. He felt another chin appearing, as his thighs grew and grew. There was no more space in between his legs, and his pants ripped at the seams. His formerly small butt rounded and grew, splitting the pants even more.
Sue was amazed at the quick transformation, and didn't take her hand off the trigger. Her brother soon grew two more chins, and became more and more rounded. His newly obtained man-boobs shifted to the side of his huge, rapidly growing stomach. His shirt ripped, and he tried to stand. He wobbled slowly as his ruined clothes fell off.
Sue gasped and took her finger off the trigger. She stared amazed at her brother's new look. His breasts had grew to almost the size of Sue's head, and his stomach was almost three feet out. He had around five or six chins that melted into his chest. His legs were huge kegs, that barely supported his weight. His butt was a large trunk that jiggled as he moved.
Ben stared at his new body, and was horrified. All those years of hard work on exercise and maintaining his figure were all lost! He sat on the ground, his weight splaying to the sides.
Sue was amused, but she felt an odd wetness in between her legs. Had she gotten aroused by watching her brother gain weight? She didn't know, but with her now-horny mind, she decided on a certain other transformation...