put "--preview-method auto" in your .bat file to get previews with kijai's nodes. also i'm using these loras at 3.00 strength with the high model and 1.00 with the low to not get nipples that are absolutely horrific. not sure if that's the best way to do it but it seems to work:
https://civitai.com/models/1336683/wan-21-big-natural-breasts-saggy-tits-huge-breasts-lora-t2v
https://civitai.com/models/1419535/wan-breast-helper

(nsfw)
big natties: https://files.catbox.moe/hug6dp.mp4
breast helper: https://files.catbox.moe/2ob7nq.mp4