If I found out my sister was a slut, I would have pulled her in the asshole, too. For these guys, getting their asses handed to them is commonplace. Although for the look, they break for a few minutes, but when a couple of drops of lube appear - they quickly sit down anally on the phallus. So this little sister is nice to feel like a courtesan, to show off all her skills in front of her brother, to let him cum in her ass. Every bitch dreams of being the best at it.
The skinny brunette must have been bored too, since she went up to the good-looking guy and started hitting on him. He gave her a cunny and kissed her lips and small tits. She gave him a blow job and saddled up to him. Then they started making love, sweet and sensual.