I'm writing this thought only based on chapter 70 - motherfucker this is subtext in the same way 9/11 was a mild annoyance. And now having read a few other chapters I missed, this sentiment's strength has increased a thousandfold.
I really like the dynamic between, man, their names escape me now. Hebimori and... Mai? Let's go with that. I really like their dynamic. I feel that it builds toward something and I'm looking forward to seeing what that is. I also will flat-out say I ship them.
And obviously the dynamic between Komichi and Erika is electrifying, good lord. As another comment mentions, somehow their dynamic is enrapturing and mesmerizing, on a level far beyond some other established canon couples.