Jon immediately noticed something felt wrong. There was a much bigger bulge in the front of his pants than there ever was before, and he unzipped them to see... a nipple. There was a breast hanging between his legs; Zoe's, from the size of it. Closing his legs at all was painful, and as he walked, it bounced. It would be impossible to hide.
He walked downstairs to see what else had changed about his family. The most immediate change was Mikey sitting on the couch with his pants down, playing with a boob between his legs, eyes closed and head back. Zoe was walking around, indeed without breasts, her top hanging off loosely. "Thanks for taking one of them, Jon. Sometimes I'd just rather be flat. I'll give you my pussy one day if you want to have fun with someone..." She smiled at him. It was apparently a serious offer.
He just shrugged back, confused and somewhat horrified. What if he took her up on her offer and got pregnant? He was distracted from that train of thought by his father sitting headless at the kitchen table. Where his head would be was just a smooth space, as if it had been taken off. Mom was milling about the kitchen, cleaning up miscellaneous things, with Dad's head next to hers, looking bored. "I love when we spend time together like this, honey." Their heads turned to face each other and started kissing, a very bizarre sight, but what wasn't today?
Mom's head addressed Jon as her shared body turned to face him. "It's your turn for chores tomorrow, Jon. And I have your penis right here, and Mikey's. You're so nice for letting Zoe store her breasts." She lifted her skirt up to show her crotch, with two penises and pairs of balls side-by-side above a vagina. She reached up and grabbed her own tit; Dad's head was grinning, and her other hand pulled it away, then reached up to pull her own head off and place it on Dad's body in the chair.
Dad's body got up, pulled Mom's tits off her chest then pressed them to his chest, letting them sink through the shirt. Jon would have found this exchange hilarious if it wasn't so strange. Mom's head was then reattached to her own body, and Dad's head to his. Dad just stood there, blinking and wondering what had just happened.
"Now you've got them. I can do my own cleaning, babe. Go play with my tits." Mom smiled, and Dad grinned back, kissing her then leaving the room, assumedly to go upstairs. "Your father is a little absent-minded sometimes. What did you want, Jon?" He shrugged. "I wanted to know how much longer I'd have to... hold this." His pants were still unzipped, and he motioned down to the tit hanging down between his legs.
Mom looked confused. "I thought you liked holding Zoe's breasts, honey. Mikey sure seems to enjoy it." This wish was becoming complicated.
