I think I would like this even more if they went over limits and aftercare.
I know this is fiction and not a guide to healthy BDSM but if you are going to address the importance of safe words I think you should also go over people's hard and soft limits and that it needs to be done before any sort of play happens.
You know like saying you are OK with enema play or having your genitals tied up.
I love the fact that they gave him a choice and he gets to say yes and no.
I am not sure I understand what is going on. There is so much context missing it may very well be the story telling but it may also be the translations. I'll come back when there is a better translation to see.
This story is so over the top I read it because it's funny