i think what they meant is that you get a choice with Kim that needs the cuckquean skill for you to choose. in that particular scene Kim seemingly gets off on being compared to another girl (i think Olivia in this case, don't know if it works with Leah also). she masks her fetish with her usual bitching of how she wishes everyone misery. i think this is supposed to imply that she is merely insecure about herself and that feeds into a kink she hasn't herself realized yet. but overall it's a rather lackluster cuckquean scene, when specifically looking for cuckquean content (otherwise the scene is great).
i didn't suspect to have Kim be the one to get the first "scene", but similar to other kinks like sharing used in Leah and Olivia paths, maybe others will get their chance too (i don't exactly see that with Bri, but since she has very little going for her route, it would definitely make her more interesting!)