I was working in a large teaching hospital. Two twin sisters were coming to me to help them with their studies as they were in last year of their medical school study. They were tiny non-identical twins. Samar was little bit taller than her twin sister Suhair. Suhair has been recently married to a medical student. Samar was single and more attractive than her married sister Suhair. Samar was coming to my room in the early morning before her sister come to the hospital as they were not living in the same house. We were spending about 10 minutes in hugging and kissing each other every day.

One day we were both very hot and she let me suck her nipples. She was groaning and with in about 2 minutes she was almost fainted and I put her down to the ground. I was very excited and my cock was about to tear my pants and trousers to get out. I unzipped my trousers, knelt down above Samar and pushed cock inside her mouth. She started sucking my cock hard. Within almost 90 seconds, I felt my hot load of cum surging and boiling up through my throbbing shaft and into her mouth. With a big grin, she was swallowing my flowing cum. However, she continued in sucking .I took the position of push-up with my cock inside her mouth and started fucking her mouth as if it’s her pussy.I was pushing my cock deep into her throat. When I returned to my position kneeling above her while she was sucking my cock and moving my cock in and out of her mouth. I opened my eyes which I closed for less than. I saw Suhair kneeling beside me. She was exposing her boobs. When I looked at her eyes she said give it to me now. I obeyed her, I stood up and put my cock in her mouth. Her sister was still sleeping on the ground. After two minutes she stood up and said fuck me. Then she jumped up into the my arms straddling me, with her arms around my neck and her legs were straddling my back. I held up her off the ground now fucking her pussy in the classical standing position. Up and down vigorously she went on my cock. Her weight was light and the position was really fantastic. Samar was know kneeling in the ground licking my balls while I was fucking Suhair tight pussy. Samar turned on so much and was groaning. She stood up saying fuck me fuck me”. I stopped fucking Suhair an sat on a chair in the room. My cock was erected. Samar sat above me in the squat position and Suhair held my cock and put it inside Samar pussy. Samar pushed herself down and cock entered her tight virgin pussy. Samar was groaning while moving up and down with my cock inside her. Suhair was sucking Samar nipples. After about 3 minutes Suhair knelt down on the ground and took my wet cock from Samar pussy and started sucking and swallowing my cum. Both girls loved what happened. During the next weeks we had threesome sex in my room in the hospital several times.