Responses
He said he might have a savior complex. I’m pretty sure that he has a type and that it’s abused crybabies. Why else would he kiss him then?
It’s quite obvious that Nanjo is interested with him, at least a little because why else would he have followed this psycho into his home and climbed on top of him?

Does Nanjo want to have his revenge by doing this? He obviously doesn't love him yet, so why is he doing this? Or he wants to be considerate of him? Maybe he heared something from a doctor or something? Or perhaps he is not decisive yet and is only going with the flow ?! ( ̄へ ̄)
One thing is for sure, though: this chapter doesn't give us any certainty about where their relationship is going at all. Anything is possible...