I feel that SH wants to understand NK "new" sumbission. I really think that NK is confused about his feelings and his place in SH life/house.
NK "liked and felt nice" the last time he slept with SH. He now believes it is no use to runaway.
SH is constantly showering him with gifts and care. This is the way SH shows his love for NK. People tell him that master favors him.
He got carried away jerking to his Master memories so the feelings are there.
Then again... that "little whore" comment from the servant sent him back to reality. As if he was saying you might not be a servant but you are still master's whore and nothing else no matter how much he favors you
Therefore he just gave in the worst way possible for SH... cause SH likes him been submissive and obidient like any master would... but NOT in this context... as a surrender with no emotions or attachment.
It is pretty clear that SH considers NK someone important for him besides just having sex with him... but since he is not used to this type of relationship and expressing his feelings it will be a rocky and painful road for them to get there.
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I wonder what happen with SH before he became who he is now and his family totally forsake him. I sense there is a story that we still don't know.

This is such a roller coaster and I love it.
I had a lot of ideas after reading this.
I can't wait for the next chapter.