The lady clearly got on the cock of the sex-starved male! See with what pleasure and strength he fucks her, and besides when they started it was a bright day outside the window, and in the final shots of the video outside the window at night! How many hours in a row did he pull on the lady?
Either this half-sister is a slut or it's not the first time she's fucked her brother. Look how calmly she reacts to his appearance. And even though his dick isn't the healthiest, he's always around and she sucks it with pleasure. And judging from the video, the girl likes to be licked there. She even shudders when his tongue touches her clit. Yes, and with his fingers he helps her catch up before he comes inside her. It's nice to live with such an available sister!
M.... It was playing with the tv off.