Kevin was a depressed teenage virgin. So when given the chance to have sex at a Halloween party he takes it. He believes it's the best feeling he's had in his life. After that night he has a more positive outlook on life. Only downside is, is he has no idea who the girl was. She had a mask on the entire time. And he loses contact with her. The only person he can talk to about this is his sister. That is when he's able to chat with her online or on skype or other video chat.
Months later he still hasn't given up hope that he'll find that girl. He has tried dating other girls but no success. Finally he gets a message from his sister that she has found the girl he had slept with. He asks for evidence. His sister says that there is going to be a BIG surprise in the picture, she sends him a picture of the girl on her hands and knees showing off her pussy but not her face. He recognizes her birthmark on her inner thigh near her pussy.
He is surprised to see she is pregnant. His sister says that before she tells him who she is that the girl wants to know what his intentions are knowing that she is pregnant with his child. He says that he wants to marry her and if she doesn't want that kind of relationship he'd spend the rest of his life doing what he can to make her happy. His sister makes sure he promises to keep to those words. Then a video shows of that same pussy that was in the picture and then he gets an even bigger shock when the girl that turns around and asks him if he still plans on keeping that promise turns out to be his sister. He is now even more sure he wants to keep that promise.
