Girl is right you are reading too into what your sensei says and does. He's just trying to cheer you up and help you grow.
Also said lolicon teacher knows the dangers of being a lolicon yet his room looks like that???? Dude follow your own warning. If our protag wanted he could easily get you fired.
TBF his room didn't necessarily say lolicon... that's just the result of him also being an elementary school teacher (+ this chapter lol).
But there's not much to fear I imagine. Japanese rooms are tiny so aldults aren't bringing a SO over until it gets very serious. That's why they have so many love hotels, socializing spots, and other attractions. Their house is just the bare minimum bed/bath combo.
You can be dating for months and never see a SOs room because there's not much to see; just a place to sleep until you go back to working 60 horus a week.