Going to dump a whole bunch here because I don't know of anywhere else to post this fetish lol
Probably most directly relevant is this commission from forever ago which I'm assuming most people here have seen
https://www.furaffinity.net/view/13976376/
Apparently that was a direct inspiration for Wild in the Forest, which I see was posted. There is a better version on the commissioners Wordpress site though:
https://collateralchanges.com/
This is probably the best armpit hair growth clip I've found (pay content):
https://www.manyvids.com/Video/11440...y-Armpit-Hair/
Also if you're looking for some extreme hair growth, Kisa Fae is the best example I've found (pay content also). If you sort her vids by date and and scroll to the bottom of the page, you can see she was completely shaved. Then over the course of the pandemic she let her body hair and even beard grow out
https://www.manyvids.com/Profile/211.../Store/Videos/
I know this won't be everyone's cup of tea, but trans female-to-male hair growth is pretty amazing imo. If you think about it, the only way someone can get hairier irl is to take testosterone. I just found this reddit user for example that has some pretty good comparisons
https://www.reddit.com/user/foxnthings/