The Nurse Role Play scene with Amily would work pretty well as a one-off porn simulation thing. Here's the opening lines of that scene: "You step in to Amily’s office, as it were. It’s really just a cluster of boulders, but with the way the mouse-girl is looking about imperiously and gesturing for you to sit on a flat rock, you really do feel like you’re back at the village doctor, getting checked on to make sure you’re okay. As for Amily, she’s looking fine... mighty fine indeed."
This scene and the Amily/Izma threesome scene are among my favorite scenes in CoC, and some of the highest quality in my humble opinion. Here are some lines from the threesome: "The amorous embrace’s effects on you are more than telling. Your cock has swollen up, long and proud, as thick with arousal as it’s ever been. The continuing caresses from your horny females have your cock aching with a less than subtle need."
Other than these, the forest kitsune sisters would work quite well, as would the scene with pre-lover Kiha win scenes, in particular the scene where you masturbate her since that might have the least parser calls of any sex scene directly involving the PC in CoC.
That would hopefully make it easy to implement on a coding level, but I am a total novice in that department, so I may be totally wrong.