I'm going to say the things I saw that were off, but before I do, I want to start by pointing out that this was amazing quality and deserves praise!
You're... Going to want to avoid the super close up shots on the character's face. Those pours look like she's growing a beard or something.
The breasts are just insane. They are so big that any animated movement on them is going to look laughable. If you made them a natural size then they wouldn't look like they were painted water balloons, but otherwise they need more flesh... More weight to them. They are moving like they aren't contained by Earth's puny gravity any more.
The same is true of when she... I don't what it was meant to be, increases her own size? I mean, it's gross, but whatever... The important point is that if you look at her stomach at around 6:50ish/9:40ish, it's become so huge and fills up so much of the camera that each movement of her hips makes her look like she's folding in on herself and there's no stomach muscles. It's like she's a skin sack filled with air. If you kept the model smaller and didn't zoom in as close, I don't think you'd have as much trouble with it. The eye wouldn't be forced to take it in so much. It's almost like you can see the rig under the skin, with the flesh unable to fold over the solid parts and everything else is empty.
The dude might be a little pale. I thought he was dead when I saw his cock when she started blowing him.
There's a strange shadow effect on the penis at around 5 mins. I THINK it's meant to be moisture on it, but it ends up looking like there's a stain on it, or a little penis wig!
Otherwise, there was obviously a lot of effort spent on this! The movement looks good and, while the character doesn't look much like the one from FF10, or sound anything like her, or act anything like her, the model still looks great. It's really excellent quality and a great standard to be set! Way to go!