Seeing that the guy records it on camera - her girlfriend tries even harder. In addition, she wants to look even prettier - she fixes her hair, makes eyes, smiles. Knowing that the guy will show this video to his friends, she wants to impress them as best she can. Female logic!
The brother made a joke, and the sister took offense at a completely innocent joke. And got kicked in the balls. At least their mother was the right one - she put her daughter in her place. That's right, let her kneel and suck it - she realized how wrong she was. Well, when the boy started pulling her up on his cunt like a whore, the mother realized that her educational task was done. Now there was one more bitch in the house.