mc is in love with childhood nice sensei meets again as high school sensei and he's now rude, its really the childhood sensei's twin.mc's male friend has a crush on him but gets with their female friend.child sensei is together with another teacher, they get married.follows them through the years and they get together at the end, has a sequel follows the mc's friends' kids. 576pm

Smiles Conceal Knives - Lynn Flewelling.
There is No Such Thing as BAD Words.
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