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Without a doubt, the highlight of this story for me was Marinette's interaction with Adrien's daughter Emma. She's hired as a nanny, but from the start it's clear that their relationship isn't going to stay just professional; she's basically playing mom, and it's adorable to watch. And when all is said and done, even the romantic plot between Adrien and Marinette is steered and pushed by her relationship with Emma, who has latched onto the mother figure in her life and isn't about to let go. It's a very domestic story, with Marinette fitting neatly into their little family and helping Adrien to keep the household running.
The counterpoint to all the domestic cuteness is Marinette grieving for her late husband and learning to accept that it's alright to be in another relationship. There are some good discussions about dealing with loss, including an unusually helpful and supportive Gabriel - possibly explained by the fact that this is a universe without Miraculouses, so he never became a supervillain and had to cope with his own loss in healthier ways (and then became a grandfather, which would have its own effects). I don't personally agree with everything that was said about healthy attitudes to past marriages, but it was an emotional read.
Note that, as is typical of the author, all characters wait until the wedding night, though it's certainly not G-rated after that (but there are some tasteful fades to black).
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