Local teacher student sexual relationships seems more common than rare in Taiwan and in the news not infrequently.
And commonly involves an adult female teacher as in these two cases in this news report.
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female school teacher having a sexual relationship with a student who was under 14 sentenced to 1.5 years in jail for each of 3 charges
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female teacher in Taoyuan was recently sentenced to 17 years and six months in prison for having a sexual relationship with a male student under 14
Foreign wolf teachers seem to be in the minority.