anyone else reading the #ShyGod series, there's some good otk scenes in there, along with a few other fetishes for good measure, mostly feet, some bondage, and a bit of abdl. Even numbered books are treated as 'extra-episodes', and have more otk scenes than the odd numbered books, but its not a bad story, overall. It's free too.
https://www.smashwords.com/books/byseries/50711
update - author is up to book 7 in the series, now, which has a good spanking party/board game scene near the end... he's writing them almost as fast as i can read them.
i kinda want to fangirl about this series, but not a lot of ppl have found it, so... just hoping someone here might have stumbled upon it too...