"WEll Rakka didn't just lay still, she squirmed and struggled"
Yeah but according with your description in the fic, Kana held Rakka pretty tightly that she can hardly squirm. She couldn't be able have struggle THAT much. =p
I guess my main point is that that scene could have been alot more plausible if Rakka laid on top of Kana in a pseudo-69 position then have her head caught in that position. Then she would be REALLY looking at her anus! =)
Your story is still awesome though.