A few of these have been made already although I think this is the first one which has really been made intentionally. I think everyone knows what to do but for those who don't: I write the first part of the story and whoever posts after me will write the next part and so on. It's up to you how much or little you write but, to make sure it isn't too much of a slog, I'd say about a paragraph is fine.
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"Stevie" felt completely humiliated, standing there in his baby clothes and a very sore bottom. He knew he shouldn't have talked back to Scarlet and the other Mommies but he couldn't help it; his frilly pink dress was so embarrassing, he really wished that Mommies Star and Lizabeth hadn't stopped him from wearing his blue footed sleeper and cuddling his teddy bear. Even though they were embarrassing, his current clothing was a lot worse; now, all of Stephen's clothes wouldn't look out of place on a one-year-old girl and his teddy had been replaced with a dolly that looked even less babyish than him. "Well Stevie," said Stacie, his "babysitter", standing in front of the other Mommies with a mischievious grin on her face, "are you ready for your next surprise?"