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https://www.dlsite.com/maniax-touch/work/=/product_id/RJ431453.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_246998/

>28-year-old Kakizaki Chigusa is a teacher at a boys' school.
>After her long-distance boyfriend breaks her promise to meet her for the first time in six months, Chigusa creates a secret account on social media for the purpose of sexual communication, due to her everyday stress and frustration.
>Confused by the countless reactions, Chigusa feels an indescribable pleasure, but she is fixated on one image. It is an image of a male organ the size of which is nothing compared to her boyfriend's.
>After an increasingly radical exchange with the self-proclaimed college student who sent the image, Chigusa finally makes a promise to meet at a hotel.
>However, Chigusa, dominated by a sense of immorality and uncontrollable carnal desire, finds a student from her class, pretending to be a college student, waiting for her at the hotel...

Base +20, Finbastard +6

https://www.pixiv.net/artworks/102459031

Base +65