This LoRA adds spanking to Wan.
To use on i2v, star it on the upper right corner, hit create, image2vid, add lora, and it's in your MyStarred.
It works on any photo, but there does need to be an ass in it. Works great on both my Pony Overknee Spanking and CapitanWebSpinner's FLUX overknee spanking.
Prompt:
A {man|woman} {appears from off screen and|} spanks her buttocks {multiple times|once} with {their hand|a rectangular paddle}, {using big and fast arm movements|gently}.