Shut up and keep making out

I’m not sure how to get the video generator to avoid doing mouth flaps like they’re talking. I want them to keep making out, dammit! So far I’ve added “talking” and “speaking” in the negative prompt but neither seemed to do much. Previously, it seemed that this tended to happen when they opened their eyes, so I added emphasis with “(closed eyes)” but that isn’t very consistent Would appreciate any and all suggestions!