A friend's older brother made me into a cocksucker. I hadn't done anything with boys or girls, and had never even shot a load myself. At a sleep over at their house, after my friend fell asleep, the older brother said we could watch TV in his room. We got on top of his bed on a hot summer night and he said it's too hot and stripped to his underwear. He said I should too. He started asking questions about me and girls. "Are you serious, you've never even kissed a girl?!". It went on to thing like "do you know what fucking is? do you know what blow jobs are?" He said pull off your underwear and I'll show you. He started sucking my MUCH smaller cock. I was nervous, afraid, new it was wrong... but kept letting him. I didn't cum.
Then he pulled off his underwear, he was huge. He told me to do what he did to me. I had never felt another man's cock. The heft of his thick dick was mind blowing compared to me. As he started getting hard, I was struggling to suck it all. He coached me, stroked his cock, pushed my head down on it. Then he flipped me onto my back, straddled my chest, and put the head in my mouth while he jacked off. He shot a huge load - the first time I had ever seen cum - into my mouth. I immediately recoiled and he shot ribbon after ribbon of thick cum onto my face.
I was disgusted, freaking out, knew what I was doing was wrong. I felt shame. And I found ways to meet him many times after that to suck him, learned to swallow, and enjoy getting him off. He helped to make me what I am today.