The girlfriend's best friend is a total nympho who gets a thrill out of stealing guys. Even when the girlfriend is right there in the next room, the friend is constantly flashing her tits and begging the boyfriend for sex. She even tells him he doesn't need to use a condom. He knows it’s totally wrong and feels guilty, but she’s so aggressive and busty that he just can’t say no. Eventually, the guilt actually makes the whole secret affair even more exciting for him.