As you know honey, Dad and I have been working on having a baby - we want to give you a little brother or sister. Well, turns out that Dad is NOT going to be making them anytime soon. I'm not going to be telling him though, as it would just upset him and I would never get what I want.
You know though, there is an alternative to all of this - an upside! We have perfectly good sperm that is very much like your Dad... What do you say, honey? Want to make Mommy happy