Jon just stood there staring at his bizarre new family; his little brother on his mom's four-armed body with his sister's breasts, cleaning up, his mother on his little brother's armless body relaxing, his father on his sister's body with his mother's breasts and his own penis, jerking off in plain view of everyone.
Karyn was standing next to him laughing. "See? Your family is so interesting. I wanna be able to do this with my family. I could give my little sister my boobs for a while if she's being a bitch, or if I just don't want them." She looked at Jon, almost pleading, but he didn't want to do this to anyone else. Having his mom's tits had sucked, and looking at Mikey, he was sure that wasn't the end of it.
He was right. His mom asked him, "Can you give your sister your body for a little while?" Jon sighed. He knew mom's definition of "a little while", and he didn't want Zoe to have his body for very long, OR to have hers. "Sally needs it to do her chores." Oh. Wonderful. There was no arguing with mom.
Jon walked upstairs, and his little sister met him at the top. "Thanks, Jon!" She hugged him, then jumped up and tugged his head off his body, his body slouching down against the wall. His head was put on her body in place of her own, which was dropped onto his neck. There was a slight disorientation as he looked down at himself and saw a little girl in a blue dress. His reach was far shorter, and he didn't walk nearly as far as he thought he should.
Everything around him was larger. Being a child, especially a girl, felt strange, so vulnerable. His body was running around the house with his little sister's head on top of it. Occasionally she picked him up and carried him around, laughing as he yelled and beat on her - his - back. His family essentially ignored him, as if he actually was the little girl of the family. Mikey on Mom's body made him a peanut butter and jelly sandwich, which he couldn't finish. Karyn being around to tease him only made it that much worse.