Thanks everybody. And yes, I, too, am under the impression that Gegged Utopia audience has its specific tastes, that is, maybe, more focused on M/F NC stuff (nothing wrong there).
Thanks for any suggestions (alas, the posting date is not my choice but by site's owner) I will keep them in mind.
As for Vicky's domination being light and not so severe, I know this. I considered focusing some more on her but I wanted to give the impression that she's driving the game.
She chooses a man to indulge on her light bondage fantasies (the narrator) and exploits her husband's submissive predisposition, probably to push him beyond what he really wanted. She's in control and she likes to play hard (when she's the dominant one).
Narrator's feelings are... what I think mine could be in such a situation. At least in this story (I don't know if a sequel is going to exist). Narrator doesn't want to lose a chance to have sex with a beautiful woman, at the same time he's not thrilled (maybe he is totally scared...) by the presence of the other guy, accepting it as a necessary evil to get what he wants.
The sub's pains awaken narrator's curiosity somehow, but the situation drives him to get his pleasure and go away. What's happening between wife and husband could be too much for his tastes.
Probably I didn't express his uneasiness clearly.