You would think they'd be tired by now

"Matthew..." Jon stared lovingly at his nude brother and sauntered up to him. Frequenting the gym, Matthew was moderately muscular, had a nice figure, and cute face. Jon reached for his brothers package and began to fondle it, causing his brother to wake up.
"Jon... wow, you look so cute today..." Matt pulled his little brother close over his naked form and kissed him lightly on the cheek. His hands groped their way down his body, finding his ass, and gently massaging that.
Jon purred happily, his own hardening cock rubbing up against Matthew's.
"Do you wanna... do what we do when mom and dad aren't here?" he whispered into his ear and nibbled lightly at his earlobe. Jon's hard on parried his olded brother's thicker, more powerful one.
"O-okay..." Jon sheepishly accepted. His brother smiled and turned the teen on his stomach.
Jon noticed Karyn and the other girl already deep 69'ing each other. Karyn was sitting upright, holding the girl's legs apart as her tongue probed her clit.
He felt his brother's warm, hard member ram him from behind. All the body fluids from the past 12 hours made him slippery and easy to fuck.
Jon gasped with delight as his brother began to thrust in and out of him.