haha you know I stumbled upon that on the reddit rule34 subreddit. I was bored and searched up Ryu Hayabusa and it came up. Here is another one with Momiji: http://gfycat.com/SardonicHeartyAntipodesgreenparakeet and a group with Ayane, Rachel, Kasumi, Momiji and some other chick lmao http://gfycat.com/LoathsomeFirsthandKitty
I was thinking that too! My guess is that a male made it, and he probably felt funny or weird making Hayabusa naked along with the girls. But even still, it doesn't look natural with him fully dressed. I myself couldn't do that...