Just to be clear, Uran has said Chise et al go to a different school than that in Mujaki no Rakuen, so this is not the same pool.
In fact, Chise goes to the school featured in one of Uran's early doujins (83443)
Sorry for the late reply, and I did pick up that series to read, but it seems that there is less loli service and more cowtits the further you go into the series, so pass.
Honestly, I'm more interested in this series...
Nanami's parents were grateful that Sensei not only found their daughter, he agreed to marry her and not let her become a shameful single mother.
Or, more likely scenario, after finding out their stupid daughter got preggers, they officially washed their hands of her and let Sensei take a...
If he didn't marry her at 15-16, he'd be in prison since he told the school he'd quit due to his relationship with Nanami.
The only way an adult man can have an open relationship with a 16-year-old is if the girl's parents give their approval and both partners are in a committed marriage or...