Yeah, I guess this chapter explains why it never actually crossed that line for 72 chapters and why it probably never will. I was convinced before Masami was interested, but after the sleazy senpai was introduced I got confused. This chapter kind of explains it and probably means nothing will happen here either. Surprisingly it seems only Eri doesn't seem to see him as a hopeless pervert, but that's only because she doesn't know him well enough.