I'm slightly disappointed that sensei was photographed in swimsuit.
Of course this kind of lewd photos were what I was expecting when I first found this manga. But after seeing how the first two boob photos weren't lewd at all, I was actually impressed and looking forward to how MC could take more professional, clothed boob photos.
Now I'm kinda mad at the assistant for pushing sensei that far. I feel bad for sensei; I imagined she would feel deceived if she saw the photos of the other two girls.
But my complaint about the story aside, I do appreciate the fan service of sensei's boobs.