We won't know about Nanjo's actual feelings until Nanjo's pov if it ever comes (tho imo there are plenty of clues about what he's feeling) but as to why he can't say no to Mok, we already know his dick doesn't work without him... So at the very least he's pent up and sexually frustrated. Add to that uncertain feelings and a savior complex, Mok is like a drug to Nanjo, he might say he doesn't want him but he still desires him.
See that’s what I don’t want. I don’t want you playing my games with me. The story already took me through emotional roller coaster. We still play games. I’m furious. go play go play go play
OK, I’m not gonna lie to you. Just give me manipulation. I’m here for it just a little bit, but can we talk about how just a moment ago he did not want nothing to do with him now he wants to fuck him like a dog. I don’t know that’s just me is giving crazy. I didn’t even expect them to have sex in this chapter the past two chapters was amazing. Cute if you would like to say, but this was seems so chaotic and mentally frustrating. Do I want to see the sex? Yes, where is the next chapter but if I’m thinking about the story from a bigger standpoint, I don’t know if I like this.