File:BreastsInAnimeAndManga.jpg

Original name: CG_437 ミニ並中大特メガ ("CG_437 mini medium to large special mega")

Artist: Aokura Shou

Source: http://claclaclala.blog108.fc2.com/blog-entry-698.html, which as of September 2020 was a dead link. There is a 2700x1280px copy at https://safebooru.donmai.us/posts/1413397