Ishu Aigan

A girl accepts and seeks out an unusual form of pleasure.... Mutsuki Academy―― Yayoi Unohana, a former student at the school, sees something she can't believe. She sees her classmate Yuki Samejima having intercourse with a large creature...... An unbelievably large creature―― Yuki was moaning with a face that she never usually shows. Yayoi is engulfed by this unusual situation and watches. When Yuki's voice brings her to her senses, Yayoi flees from the scene. She asks if she, like her, would like to be partnered with this "special pet"! [translated from official website]