edit: I've come to learn that there are only two more chapters left in the story, making the majority of this post pointless ramble, but I don't feel like deleting it. feel free to read it as though the story had continuation, if you feel like it.
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I am going to start speculating where we go from here, because this will either be the denouement, or there will need to be a new introduced element of chaos or trouble. The Disney theme park could simply be an implicit-resolution/symbolic "happily ever after", I suppose, but I doubt the story will end here.
So, thought.
Moka is now newly indoctrinated into the world of bullying. She's discovered that she gets her jollies from it, and knows that he gets his from it too. Given her suddenly accelerated, new experience with this kink and being able to play-ball at the same level as the ones who ran this schtick for years, I'm going to guess, she will go a step farther than even Ueno is ready for. Ueno might feel properly, truly bullied during one of her passionate moments, he might beg her to slow it down or stop entirely, and she might treat his resistance and protest as a new flavor in the meal: non-con.
There's absolutely nothing yet for me to support this possibility, but I could imagine it in the circumstances. I think if the author introduces bondage elements, that's a flag for this to happen (especially if they both jump straight into it without anyone teaching him or her about BDSM culture first).