What happens when the December part of a May-December Romance
has children... who are around June. They might end with a stepmother who is younger or at least the same age as them.
You can expect lots of resentment from a girl to a stepmother younger and/or better looking than them. If it's a boy, and the stepmother is to be portrayed negatively, you can expect at least attempted seduction.
Up for Grabs
The main reason behind the murder in Legally Blonde
, both the movie and the musical.
It happens to a character in If Tomorrow Comes
, by Sidney Sheldon.