They started moving their faces closer and their lips met. “MMMM, your lips are so good, Sandy!” moaned Cindy as she started licking Sandra’s l...ips. Cindy doing this and their hips grinding, Sandra was getting so hot. They sunk to the carpet as Cindy kissed her long and deep. Laying Sandra back on the carpet, Cindy started kissing her neck lightly and caressing her breasts, making sure to tweak the nipples lightly. “MMMM, that feels soooo goood,” Sandra gasped. Sandra shyly at first started. I am not gonna lie, right there with my penis out in front of my sister, it looked huge, I had measured it to be around 20cm[8”] long and 4cm[1.6”] across, I know that’s not normal at all, but not only that, but the fact that my sister is rather petite at 158cm[5’2”], I was wondering if it could even fit inside of her… And each of these thoughts would send blood pulsing through my cock, already at full capacity, throbbing with each one of them, I didn’t delay it anymore and started slowly. Well, that was my first time doing anything like that," she whispered. "And it was... well... it was great." It was fun," I replied with a grin."Yes," she continued. "But I'm not really ready for anything more right now... and my mom says it's not a good idea for us to go out or anything." Okay." She really likes you, don't worry, but she is afraid that Dave will get upset about it and then you might not be friends anymore." Yeah, I was thinking about that," I added. "He will be really pissed. " He replied setting his folder on the table. He stood up and walked toward the box of rubber gloves.He stood next to the exam table as he put on his gloves. He grabbed his stethoscope and slowly untied the back of my gown."Sorry, but this is going to be cold." He said placing the stethoscope on my back which instantly gave me a nipple hardening chill."Could you take a deep breath." He asked.I did."Now exhale." He said before moving the stethoscope to the other side of my back repeating the.