I called him up the next day. "I'm sorry," I explained, "it wouldn't work. Not that I'm completely against the idea, but it doesn't add up."
"What do you mean?" he said. "I know you told me you're a guy, but... any guy who would intentionally turn into a pregnant woman can't be completely against being feminine."
"Look," I explained. "You want to age down to 30. You also want me to be your daughter. In order for that to work out, you'd have had to have been a father at age 15, and I'd have to be a mother at age 15. I guess it's possible, but people would think it's funny or that we're sluts or whatever. Besides, your daughter was born in 1949 and had a 3 year old daughter in 1976. That makes this body around age 24. I certainly don't look 15."
"I see," he said.
He sounded a bit miserable, but got happier once I explained, "That doesn't mean I won't do anything like it, it just means we need to think of something better. You could age down to something older than 30, and then I could become your daughter. Or you could just keep it at 30 and I'll become your wife."
"But I told you I can't... That's my daughter's body! We're related!"
"Once I give birth I can change again. I can change from your daughter to your wife, if you have anything she wore, and I can change the baby from your granddaughter to your daughter."
"Hmm... I wonder."
"Or you can turn into me, the old me, and then our bodies wouldn't be related and I could become your wife... and you wouldn't even have to worry about making a reason for me to disappear."
"Could be," he replied.
I just continued to give suggestions. "And if you want us to be related, I don't have to be your daughter or your wife. We could be sisters! You can just turn into me as I am now and we can both give birth to your granddaughter. Or there's another way to be your daughter."
"What is it?"
"Wait until I give birth. Then you age down to 30 like you said, and I age down to 10 or so. The baby and I can be sisters then--she'd never know I gave birth to her."
"Do you really want to be 10?"
"I don't know. Probably not but it is an idea."