I found this on Sankaku Complex but there was no tag indicating the artist or source. Tineye and a few other reverse image searches brought me nothing, and I couldn't find it on sadpanda either. Anyone have the artist's name? Or at least the name of the set?
>>15044997
Image searched it, Found this.
You need a pixiv account to see this.
http://www.pixiv.net/member_illust.php?mode=manga&illust_id=48813731
I think ballons were added later.
http://saucenao.com/search.php?db=999&url=http%3A%2F%2Fis.4chan.org%2Fr%2F1482197091333.jpg
https://chan.sankakucomplex.com/post/show/5749683
https://chan.sankakucomplex.com/post/show/5750867