Puzzle gif: MOMMY AND HER LITTLE DARLING (Patreon)

Time for one of our Sunday puzzle gifs, where I present an enigmatic transformation scene and we see if you can come up with a fun scenario to go with it!

This one stumped me. I love a story where two guys are transformed into a pretty mommy and her little darling, but I just couldn't think of a plot that fit this gif. Any ideas? The suggestion I like most will get posted here!

As much as I like this one, I'd sure like it more if the kid was her daughter, instead!

It's a few weeks later as I write this, and longtime patron BB has the winning suggestion: "Guy complaining to his step dad that he’s a terrible parent.  Fate changes it so he’s now the parent and his step dad the child.  Though now they’re step mom and son?"