За лаштунками - перший само кулак Серени

In the video Big Bucket Pussy, you might have caught the moment in which Serena tries to fist herself, and then eventually gets it with Leo's help - This was in fact Serena's first time fisting herself!   Here is the full version of that moment - The Behind the Scenes look at Serena getting her hand in her pussy with Leo's coaching.  And yes, she got her hand in past the knuckles - a crucial distinction in our humble opinions ;)