Julius Caesar and Mark Anthony are identical twin brothers. From birth, an obvious physical difference separates them: Mark has an abnormally large penis, and Julius has one of standard size. This inequality will profoundly mark their lives.
During childhood and adolescence, Julius suffers in silence while Mark becomes the object of admiration, rumours, and desire. Julius develops complexes and insecurities and even buys a penis extender that he uses in secret. For his part, Mark actively explores his sexuality, experimenting with masturbation and paid exhibitions of his member to female classmates. Later, he has sex with his teacher, donates semen, and finally ends up entering the world of adult films.
At eighteen, Julius meets Jessica, a wonderful college classmate with whom he has his first romantic and sexual relationship. Everything seems to be going well between them until, one night, Jessica mistakes Julius for Mark and sleeps with him. This triggers a crisis between the brothers. Julius tries to impress Jessica by taking three Viagra pills and ends up in the hospital.
Mark, realizing the damage he has caused, helps his brother recover. Shortly after, he learns that he is the father of a child with his former teacher. At the same time, Jessica tells Julius that she is pregnant but is not sure who the father is.
Julius decides to take care of the baby, whether it is his or not. When the child is born, a physical detail confirms that Julius is the father, making him the happiest father in the world....
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