Animation, character and background design, physics, sound effects, lighting, shadows, and voice acting are extremely crisp as well as a well used camera angle. Nice work with the cold air being exhaled. Good balance of the amount of saliva in the strings. I like the how her pupil shrunk near 0:38 along with seeing the dick being thrusted inside her throat. However, the lips should be moving to sync with the voice acting. The cumshot also needs a bit of work for the physics of it, but most animators have the hardest time making the perfect balance with the physics of how the load is delivered, so I can't really hit you too hard with that. At 0:20, I'm pretty sure dicks don't get redder when they get closer to climax, at least in my experience. But overall it's really solid work.