Not Bad, not bad at all.
The animation and art was great. Just seems a bit incomplete. Nothing is clearly labeled, that's fine and all the but the forward and back buttons are practically hidden, what you should have done was put a label with arrows on the bottles and then they glow when you got over them. It's good not to patronize your audience but at least make it obvious. A button is clearly a button, unless it's not.
It iss short, could have a little more, like a grinding animation or cum out option something like that would really flush it out. Also it's be nice if her expression change a bit over time, nothing huge, just something.
Also the sounds could use a little bit of work. I've found it's very hard to get sound for something like this to sound natural but it can be done. Like the moaning for the second animation just loops with the animation, it really shouldn't or ay least not the exact same sound over an over again. Random changes in pitch and length is all that's need to make it seem more natural and it's something you should really do. Also a little variation in voice clips wouldn't hurt either.
In conclusion it's a nice little loop but I could be so much greater with just a few little things added.