What you're seeing are the first two animations for the 69 contest branch (transition + equals animations) - for the penis/penis genital combination.
It will require at least two additional positions (character 1 dominating, as well as character 2 dominating). This will serve as a pilot, and once I'm satisfied with it overall, I will also add penis/vagina, vagina/penis, vagina/vagina combinations. These will be slightly easier to do, since they can be based on the initial penis/penis combo and changed accordingly.
The transition seems to work ok from pretty much any reverse straddling action (in the example you can see it starting with reverse_straddling_forced_oral, and coming back to it), but i need to test some more.
It has been a bit of a trial and error with regard to animating and preserving the right positions, and not having the animation create issues with arms / legs jumping during various transitions, but I managed to get there.