Image is screencap of Nao tilting her head forward and looking downwards with somewhat exxaggerated perspective.
Nao is a character from Boin Resort and Boin Lecture series of anime and visual novel games. Both subtitled hentai anime series are available at
bakabt.com:
http://www.bakabt.com/129929-boin-lecture.htmlhttp://www.bakabt.com/141724-Resort_Boin_1-3(Censored)_Fakku.htmlAlso, if you like the art style of Resort Boin and Boin Lecture's characters, then you should look at the artbook by the artist Jin Happoubi (八宝 備仁).
Bakabt.com has artbooks of all kinds, so you should look up all the big breast character artbooks there. Jin Happoubi's artbook is available via:
http://www.bakabt.com/146545-Jin%20Happoubi.html 