I love fisting I get anal fisted every chance I get. Nice girls but this is not full fisting. She is folding her fingers and only fingering that chick's ass cheeks. But I must say it's one of the better blocking via elbow and arm /folding of the fingers that I've seen in a while.
Satanismo is correct. Many camgirl lesbian fingering, penetration is fake. They use blocking and fold finger, in this case hand behind ARM. All about angles. Fake.
I am definitely no expert on this, but the video looks pretty convincing. How can she fake it? Honest question.
-H