From an adult manga. A woman is caught hacking into some computers, and is chloroformed from behind. She wakes up bound tightly and gagged.
Information about this manga: http://www.mangaupdates.com/series.html?id=49737
Read: http://g.e-hentai.org/g/415328/773646af02/
Some random screenshots.
* Image #1 is from Innocent Blue vol. 1
* Image #3 is from a gal game called "sen sei" (possibly).
Keywords: adult, hentai, anime, video, screen caps.