A man finds various excuses to go to his female friend's house, such as to help her study or to take care of her when she gets drunk after drinking alone. They have never had a physical relationship, but it is a man's nature to want to have sex if the opportunity arises. He takes the plunge and asks her to let him kiss him and rub her breasts, but she doesn't respond well. As a last resort, he kneels down and begs her, saying "Please let me do it once." He gives in to her pressure and in the end, she lets him have sex with her, which turns out to be a very convenient female friend.