It pretty much says it all. At 19 a man loses his parents in a car accident and also discovers he was adopted so he searches for his biological family and once he watches there house too nervous to go in and sees a beautiful woman maybe a year or two younger leaving the house. He realized that it is actually his sister not some visitor he originally thought she was. He follows her around to see what she is like and what she does and finally approaches her without saying who he is and asks her out for coffee. Things escalate from there and soon they are in a serious relationship. What does he do now? Can he ever tell her? Perhaps she gets pregnant? He is trapped and has to figure out what to do and that would be the story in a nutshell.
Changes to it are welcome if they are offered and would be open to discussion.