Noticed that the cat girl's hair leaves her head, near the split in her hair. Threw me off, makes me think she's wearing a wig-may want to consider fixing. Also the way the cat girl's ankles seem nailed to the bench seems weird to me. I wish there was more use of depth in the bench at least, but the bench makes a nice subtle transition between the fore and background. Lastly I think it would a great affect if you made the bench move with each thrust. Loved your use of light to depict the body motion, would of loved to see some in the hair.
Overall: Good, but not great
I am sorry, but that miss with the hair...this was a commission and you left that in?
-(mind you, I have no idea what you charged)
On the plus side : smooth animation, loved use of lighting, and nice music
that almost syncs well with the loop.
Hope to see more, as you gain experience.