I second the idea of balls twitching. Yes, please. ^-^
As for the sweat: That's not necessarily something many people need to see but I think it shouldn't be too difficult if specular maps can be used... at least I think so. I haven't worked with textures for a bit too long.
Maybe not all the characters would have sweat, characters like the rhino and giraffe might, since no fur lol and what I mean is, the males balls sort of "clenching" as he cums.
in addition to ball twitching, some kind of urethral twitch/bulge to go along with the cum animation would be nice. just something going on in addition to the fluids to give more depth to the whole "cumming" part
also, characters should have some sort of expression option for when they enter a cum state. currently it's more of a "beep boop processing cum operation #41238" than a "OH WOW" feel.
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As for the sweat: That's not necessarily something many people need to see but I think it shouldn't be too difficult if specular maps can be used... at least I think so. I haven't worked with textures for a bit too long.