Deciding on her big round butt, along with her hips, Jeff confirmed the changes and went to the mirror to watch the changes happen. His legs trembled as warmth spread through his butt, and it started to grow. Placing his hands in his cheeks, he enjoyed the feeling of his muscles dissolving into fatty tissue, and the swelling of his slowly growing rear. His fingers were now played across his cheeks as they poured flesh in between his fingers and around his hands. He reached around and started playing with himself as his booty continued to expand. He gently moaned as he squeezed his plush bubble butt, and his hips started to warm as well. It felt like a pressure was building in his hips, and he wiggled uncomfortably, though he continued to squeeze his increasing backside and rub his vagina. The pressure was becoming unbearable, and Keff backed into a wall, grinding his completed ass into the wall trying to alleviate the pressure. "Fuck, uh, Me, oh, make it, ah, stop, mmm" he gasped between moans of pleasure. Finally, with a resounding crack, his hips shot outwards, pulling with them a generous amount of padding. "mmmmMMMMOOOOOHHHH YEEAAAAAHHH" Jeff squealed at the sensation, collapsing and bouncing bouncing as he landed on his big butt. After a minute, he stood up and examined himself in the mirror. It seemed that the girls features had been enhanced due to his age. He had quite wide hips which reached out a bit past his shoulders, and his ass was huge! It jutted out of him like two small softballs. It remained tight and firm, yet maleable and soft to the touch. Giving his ass a slap, he sauntered over to the chrovomiac and wondered what part he should switch next...