Slight clipping (with the head, and how Undyne's hand/wrist clips into the chair.). Shift in expressions is kinda nice. (Honestly really good in the climax) It is a bit "eh..." though.
He has a hyper dick, she's sucking his hyper dick. Not much is going on.
And the cum is that "spilling out everywhere water". It just feels lacking some "oomph" to it.
And I mean: You kinda HAVE to edit the models, since wo don't really finish them, genital wise xP
Bit lazy on that, but the rest of the models are really top notch.