The quality's good but there's barely any plausible movement, he's balls deep in Deku, there's barely any dick for me to animate. I'm posting this pic as an example for a perfect suggestion.
Dick is halfway in or even better, just the tip is in.
Plaussible penetration: the dicc must be easy to insert in a swift simple motion.
Absence of hard shadows: hard shadows can move in unintended ways
Almost flat colour: complex textures are hard to patch
Motion blur can be fixed: simple lineart motion blur instead of actual blurriness.
Not much occlusion: not many things one in front of another
BONUS: Pic is from a CG set (saves so much layer fixing)
Compare with >>2469284
, lotsa dicc that only needs to move down and a nice asshole to animate, not much occlusion, CG set.