Just found out about a French woman named Titia - She has been doing her own gokkun parties over a number of years, and they have now started selling videos via their Twitter account (@GokkunBigLoads, just DM them).
I've not seen any of the videos, but judging from these pics, she is legit as fuck. Her last party, she apparently collected 46 loads with her mouth and put it all in a glass at the end to drink, Premium Bukkake style.