Frankly, it was a little skill and a lot of luck.

I sent the photo of the girl to unlucid.ad, and put in a prompt to have a large dick cum in her bun. The first output was the frame where she turns and looks at the camera. I made a reverse video, and put them together, so she would look at camera, then turn away.

The bun fucking is three segments. Two of just the fuck segment, two joined to make one, and added to the first segments. Finally the cum shot was added to the end. In all 5 video segments put together.

Sorry, I don't remember the prompt, but it was something simple like "man fucks girl's bun, and cums inside with it dripping out."