It took me a minute to notice that those weren't wings and there was some red stuff in her back.. I guess she's some kind of robot? The element of story in this image is great! Wonderful expressions on their faces.
Oh god! Robot sex slave!? It's worse than I thought! No, that exclamation there wouldve been what I thought if it was a coinslot XD. BUt huh...an opening. Maybe she's a computer? A spy? An AlIeN!? THe world will never know.