https://www.dlsite.com/maniax/work/=/product_id/RJ01160268.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_351870/

※2024年8月 7ページの追加をしました。
※この作品は2017年発表の単行本未収録の商業作品です。
※表紙は描き下ろしです。本編との作画の違いがありますのでご注意下さい。
https://e-hentai.org/s/c293264eac/1093121-165

Base +22

The additional pages end with the teacher having to speak with "two people" after class and the book saying there's a suspicion the female MC had had experience with underage sex.

The baser parts of my mind instantly went with "teacher NTR" but because the teacher is female it instantly shifts into "teacher-involving threesome". Any which way, awesome.

Base +6, Ayachisan0 +5, cannonballz +6, wowz098 +10, Fixdjhf +10

Other Language or Version
compare to manga version, it add the new cover
Japanese
Japanese 2024年8月 7ページの追加をしました, You are here!
Chinese
English translated by spaceMoose

Series part : 思春期と本気セックス
Japanese digital, COMIC 阿吽 2017年5月号
Korean digital

Series part : スク水ひより漫画(part of 幼馴染とHした翌日)
Japanese
Chinese

Series part : 幼馴染とHした翌日
Japanese digital
Korean digital
Chinese digital
English digital, translated by Benri

Base +53