The guy said it was a good surprise that morning. They live with their grandma and that morning his sister came to his room. He knew it had to do with the talk they had the night before. He told her that he found her attractive and fantasied about her every night. She enter the room with her robe, that she took off. She tried to hide her body laying down lower on the bed on top of the bed cover. Her shy attitude when he took out his cock from his boxers made him hard almost instantly.