The NTR will happen again and again. But in later chapters, instead of trying to "win" or getting bitter over it, the mc will try to "adapt". Like he'll use her body to their advantage, finishing a contract or getting them to a better position, etc. This will corrupt him and his view on morality. Then he may start to take a liking to it which leads to swinging, netorase (willing cuckold), etc. Swapping partners with nobles to gain power, or join in their secret orgy... something like that
Hope that answers your question.