The twins walk in.

“Matt!” Ann said as she walked into the room. “What happened to you?” She asked as Becca joined her. They both stood there and watched as Randy bounced on his cock.

Matt smiled at his sisters and said. “I had an accident at the lab today.”

“If this was an accident what happens when you guys do something right?” Becca asked sarcastically as she started to take her clothes off. Seeing her strip Ann giggled excitedly and started to do the same.

Seeing his sisters strip he raised an eyebrow and asked. “What are you two doing?”

Becca smiled wickedly as she pulled Randy off his cock and said. “Joining in on the fun.” She pushed Randy down on the other side of the couch and started to suck her cock.

Ann knelt in front of him and said. “You didn’t think you were the only pervert in the family did you. Me and Becca fuck all the time.” She leaned forward and started to suck his dick.

Matt was shocked at how open his sisters were to committing incest. Looking at the pen he wondered if he should use it.