So this girl acts all shy but in fact is a huge pervert, creates a harem for her lover while making clear that she is his number one and on top wears glasses? Waifu material!
Seems I have a different interpretation of this chapter than is popular. I think Uchida only assumed control of the situation on the last page really. Those three kogals got stupified when sensei frees his hands and the hentai starts. This is their requirement for setting him free, but that's also how Uchida takes over control of him.
...That ending.
I admit, I expected her to be hiding some kind of secret when I first saw her, but I didn't quite expect that kind of twist...
Well, it was a nice twist though. He ends up with a harem and not having to put up with all the 'bullying', all the while she makes it clear to him who he belongs to.
And while I can't tell if he's happy with his situation or not, it doesn't seem that bad.