Been playing with an idea to combine Spy x Family-styled family/lovers/love interest hiding their secret identities from one another and possibly trying to make a working family with magical-girl theme.
Basically instead of a regular, young magical girl the power would be granted to an older single-mother due to reasons that can be discussed, and she'd end up defending the city and her family with her new powers from a villain (who'd also be a mature and older woman/man/NB/futa/etc, also possibly a single parent)
In the civil life the two would meet one way or another and the spark of romantic interest would ignite between them. However neither of them realize that it's their arch nemesis whom they have just encountered, so while the two grow closer and closer in daylight, they are fighting against one another in moonlight, not knowing that the one they are steadily falling for is someone they eventually have to beat for the sake of their respective side/organization later down the line.
Been toying with the idea of magical girl combined with mature woman-character for a long time, but struggled with coming up a plot that would be fun to play with one and one that would have solid plot with the possible lewd anticts, schemes and events between the magical girl mommy, villain(ess) and/or something/someone else that could be added into the mix from the villains side.