Diane thought for a moment, looking away at the slit between her mother's legs, then looked away saying "I can't, this is totally wrong. I'm a girl and you're my mother, I can't do this."
"Yes you can. It would be a waste if you didn't take advantage of your tool while you have it." Christine said
"But, that will be betrayal towards daddy, not to mention that with balls like these I must be fertile. What if I end up getting you pregnant?" Diane said
"Don't worry about that. It's just a small sacrifice for the sake of our daughter and he will understand." Christine said and hugged her daughter, kissing her fervently.
Diane's resistance diminished as she warmed up to her mother, returning the kiss and hug. The tip of her dick grazed the lower part of the breasts of the two that were pressing against each other.
In the middle of their embrace, Diane noticed when her mother started to move her hips, but it wasn't the movement of someone who was preparing to be fucked. She then stopped the hug and distanced her, then looked down only to discover that her mother's pussy was no longer there, but instead a tiny dick, just 2 inches long, was hard between her legs, and equally tiny balls to go with it.
"Oh no. Look mom, now you have a dick too." Diane said
"I noticed something was different, but because it felt so good I didn't worry about it. It's a shame, so I won't be able to have you fucking my pussy." Christine said with a mixture of satisfaction at the change she had undergone and disappointment at no longer being able to satisfy her daughter as she intended.
Without showing any concern, Christine began rubbing her child-sized dick against her daughter's, feeling that her daughter's new dick was still growing.
Christine's dick ends up...