doujinshi : [Shinozuka Yuuji] Mrs. Yukino's Sex Education (Yukino Sensei No Seikyouiku)
[Shinozuka Yuuji] Mrs. Yukino's Sex Education (Yukino Sensei no Seikyouiku)
Link
/r/doujinshi - hentai with a storyline
original: https://reddit.com/r/doujinshi/comments/e8lqn4/shinozuka_yuuji_mrs_yukinos_sex_education_yukino/