Then she did something I thought she would never do, especially this being my 15 year old sister. She sat down on the toilet and spread her legs wide ...pen!!! She then pointed at me through the mirror, then pointed at her own crotch. Then she started rubbing herself. I just couldnt take it any more. I pointed to my own crotch, the whole time her watching me stare at her in amazement from the couch while she masturbated on the toilet from the view of the mirror. She nodded her head in approval,. "Elizabeth shook her head and peeled off. "When in Rome..." she said and followed me out. Lisa and Barb exchanged a look and then came along too.Pretty soon Mary and Amanda came along and we sat in the sun, drinking coffee (and one tea), talking about plans for the day (I was working, Elizabeth has a short afternoon shift, and my girls had a day of heavy beach combing scheduled.)"If you'd like to wait until later for the beach, girls," Elizabeth offered, "I run some of the zoo's nature walks. With his hands on my hips he pulled me back as he arched his back driving his cock deep as he started to cum. I could feel his hot cum squirting inside me over and over again, I thought he would never stop. Finally he relaxed and pulled his cock from my hole, I looked down as I felt his cum running out of my ass and down my legs. We finished showering and rinsed ourselves off and stepped out to dry our bodies. His cock was was still standing proud and hard as we left the bathroom. He went to. She could feel him tightening up and knew that he was about to cum.He finally let go, shooting 6 to 7 blast of cum dip in her womb. She came once again as it hit her.They collapsed on the bed together, both out of breath. For Sue it was the best she had ever had with Jim. She wondered if Gus was watching from the window. Jim rolled over on his back completely exhausted. Sue propped up on one elbow and looking him in the eye she asked, "is that what you want me to do with Gus? Can you let me.