When a man faces fear, he screams at first then recovers his nerve.
It's just happening to the man, feeling his heart beating while his mind is regaining his equanimity.

This is a story of a man who could not resist his sexual urges.

One day, he has another penis suddenly grown between his crotch. It produces abnormal behavior of him. He learns intense sexual pleasure with his two cocks!!

[From DLsite English]