Hi, I like your result, but its very hard to make a smooth transition from video to video therefore I don't do it very often.
At the moment I use Grok a lot is is getting better from day to day.
First I generate a picture because it is easier to get it through the NSFW-Filter if you are able to cover the genitals with hair. Regarding prompts: I just try and error and over time you know how you have to write some things to get the result you want.
For example at the end of every prompt I write: "The picture is shot with a smartphone and in amateur style. The lighting comes from the smartphone flash."
In my opinion this makes the picture more realistic and it makes the hair more shiny what I very like.
After I get a good picture I use rather Grok again and cut out great frames which I can use for my WAN2.2 workflow to get cum or a penis involved.
But overall it is just try and error and I spend also a lot of time.