Sweet. I had been wondering about the source. Although, I was disappointed there weren't more gifs like this. A search for "hebameki gif" only results in this picture and one with Tifa's eyes blinking.
I find sakura cute here but the whole rubbing thing creepy as hell, and her blinking in reaction to it. It's so weird. As a still, this would probably look better (unless you're a man who fancies rubbing your dick on the cheek of a girl who is completely frozen, looks braindead, and blinks occasionally).