Kudos for using her base model. I'm not a fan of skinny or whatever sized women but I am a fan of the character. I'd rather see her as she was originally done.

idk her pussy looks hungry let's feed it!

Awesome character and background design, the thrusting speed is great, the slight camera angle movement is perfect. The facial expression should change more with the lip synchronization which also needs some work being with the breathing. Additionally, I suggest some reactions from Aerith. You could have her tilting her head back a little, gripping a little at her ass, and maybe a leg spasm from her as some examples. You should probably also add a bit more red around her clit. With all that being said, you still did a great job.