Few things to address here.
First is the lack of music. I know it doesn't have to be fancy as shit, but still have at least some sort of ambiance in there.
Second is the moans. I don't know how much recording you did, but there seemed to be a rather limited selection, and with many repeating, it sort of loses its luster, at least for me.
Lastly were the sound effects themselves when the girls were cumming. It all sounded the same [and I'm sure it does irl] but with each pose, there seems to be differences in force, so it should vary, even if slightly.
On the plus side, the animation was stellar both in art style and fluidity, though kinda lagged when all three started hashing it out. Nevertheless, it didn't detract from the animation.
Not to mention girls with dicks. Well, hey can pretty much fuck themselves, can't they? har har.
5 5 Very well done!