My Sister Scarlett came over to visit the other day. I had to run out and grab my dry cleaning so I told her i would be back in half an hour. She knew my Boy was in his room studying so she popped in to say hi while Mom was gone. When she walked in, she noticed he was masturbating NOT studying. She got turned on and decided to climb under his desk and suck his cock. I got back quicker than expected and walked in on her blowing him. At first I was really mad but the sight of his cock in her mouth really got me turned on. I told her that she had to finish what she started. After a few minutes of watching her suck my sons cock I could not resist. I had to taste it too. I joined in with her. We both sucked his cock until he could not take it any longer. He stood up and unleashed a huge load all over both of our faces