This is mostly aimed at male/futa based characters since i'm not entirely sure how such a thing could be applied to vaginas and what have you.
Perhaps have a slider that sets how much the penis twitches and how often, something like this might also be interesting to see applied to the vagina/anus of the characters aswell but i'm not sure how well that would work.
Same thing goes for throbbing, which might be something really neat to have when being used in a cumming scene
Here are some examples of what i'm getting at -
And as for the dripping for the penis or cum dripping in general -
but it would pretty much be the same as the vaginal drip but for the dongs! or you could have something a little more exaggerated like the throb gif in the first spoiler above.
well.. maybe not THAT exaggerated, also apologies for the mess that is this thread.. i don't really do forum stuff often :P
Comments
http://forum.yiffalicious.com/discussion/18/sweat-and-ball-twitching
http://forum.yiffalicious.com/discussion/226/zanarck789-suggestions