It's not what you think it is, I think ... though it is Slave Morgiana from Magi Slave Girl. Image source: vidcap of Magi Slave Girl.
Found this on a site called "Sankaku Complex." While images like this and MUCH more explicit than this are commonplace in hentai and ecchi, the toon this vidcap is from is apparently an actual anime. So anime fans who like a little slavegirl hottitude in their stories might want to check it out. I personally have grown tired of hentai and ecchi, they're too porny and predictable nowadays. Call me jaded.
Image from the hentai Maison Plaisir. The male characters' mother and sister prepare to have a cocksucking contest. Hentai may be predictable once you've seen a few, but they're still fucking weird. Image source: vidcap of Maison Plaisir.