Responses
It's from chapter 2 of http://www.mangago.me/read-manga/k_sensei_no_yaban_na_renai/
K-sensei is a series tho like Kuro Neko so http://www.mangago.me/read-manga/k_sensei_no_yajuu_na_aijou/ is the first of the series
http://www.mangago.me/read-manga/mousou_cherry/mh/c005.5/3/