>>14179
There's a bunch of ways depending on the scene, but something like 'The throat is pushed down over his penis all the way down to his testicles' generally works. If no prompts work, consider changing models because no amount of prompting can save an unsuitable model. Looking at your webm it looks likes like you are using a first-frame-last-frame set up judging by the discoloration at the end? If so consider a vace set up since its support for that is better.