To get it working you need to place the player on a waypoint and make them lay down using
Code:
SetLaydown(true);
DoDeselect();
loc.ms.laydown = true;
SetMainState(loc.ms);
Then you need to place one of the girls on another waypoint so their hole(s) aligns up when using the animation
The riding animation is in the Christmas story and not in the dungeon so the animation will need to be added then referenced in the char_base.dat Or you can use the fuck pole animation
I just made the player lay down and forced saiko into the fuckpole animation
slowly moved under her then forced the rest using the dev camera