The author's Isekai Minecraft series got licensed so this is all that's left of his that's not licensed.
Added poll to the OP.
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so he's 39 +/- and she's 17
I guess that's not creepy in the setting - but would be in modern USA
Scenario reminds me of: The Door into Summer, classic but not great sci-fi
I still want to read this
Thanks for the info. I'll update my OP.
Licensed by Yen Press.