American family drama with a stepdaughter and her best friend

The scene opens with a young woman, presumably a stepdaughter, lying in bed with her best friend. The two girls are chatting and giggling, clearly enjoying each other's company. Suddenly, a man enters the room, presumably the stepdaughters uncle. The uncle is clearly uncomfortable with the situation, but the girls are oblivious to his discomfort. The uncle tries to leave the room, but the stepdaugher's friend insists on staying. The stepdaughtered leaves the room, leaving her friend alone with the uncle. The two of them engage in a heated argument over the stepdauhter's presence in the room. The friend defends her friend, saying that she is just there to help her with her studies. The uncle eventually relents and agrees to let the friend stay, but only if she agrees to be his sexual partner. The friend agrees, and the two of them begin a steamy sexual encounter.