He does not yet know it, but passed out with his mouth open like that, he is about to taste his first cock.  Photos of him with his roommates dick in his mouth will be circulating the campus by the end of the day. It was only meant as a joke, but when the guys on the floor saw the images, it put ideas into their perpetually horny brains.  The thought that having a cock sucker available 24/7 in the dorm was too good to pass up. 

The next morning he was put on his knees in the communal shower and forced to recreate the photos. For the next four years of college he sucked gallons of cum out of his classmates cocks. He never really learned to enjoy it, but his skills improved over time, and he became a world class cocksucker.