She seems to be an amateur, and I was unlucky in finding out the source.
But I found some more pictures: http:// www. poringa .net/posts/imagenes/2121932/Megaculo-Megapost---amateur.html
The BBW on the right is Kelly Shibari.
The one getting tickled is Ryen Ryder.
The name of the full video is "Intense Fetish #1009 - Lesbian Subs Trading Places". :)