It would be rude not to

The girl that approached you walk beside while her friend lead the way. While you walk she tells you her name is Simoan and her friend's name is Alice. Simoan is nineteen and has light brown hair and blueish grey eyes and her friend Alice just turned eighteen looks very similar when you ask her Simoan tells you that thay are sisters.
Alice open the door as soon as you arrive. Before you can say or do anything both girls turn to you and pull your pants down. Your twelve inch cock is still erect and pointing straight out both girls kneel before and start to work on your cock with their mouths and hands. Even though your enjoying it you stop them and ask them to undress both girls do a slow strip-teaze for you. They work well together removing each other's clothes and you get the impresion they had done it before. The way they licked and sucked each others nipples when they removed each others bras. Once they had finished they turn to you and ask where do you want to start?