I was 15, my cousin was 14. We had been renting porn movies and watching them while his mom was gone to work. We had played with our cocks in front of each other a few times and I was dying to suck his but had no idea how to approach the subject. One movie we had rented had a scene where two guys were about to fuck a woman and she told them that they could only fuck her if they sucked each others dicks first. My cousin and I were both naked on the bed beside of each other, stroking our cocks and watching the movie. I was staring at his cock more than the movie LOL
After the scene we started talking about what we would do if we were in that situation. He said he didn't think he would suck the other guys dick, I said that I would. He was surprised. I then added that I would do it even if I wasn't getting pussy. He got the point but didn't offer to let me suck his. After some more movie watching I suggested that we stroke each other and he agreed. The feel of his throbbing cock in my hand was pure heaven. He stroked me for a minute or two but then let go and just laid there watching the movie while I stroked him and played with his balls.
I was so horny that my inhibitions were totally gone and I just outright asked if I could suck it and he said that I could. I was so nervous that my whole body was shaking. I leaned over and started sucking the head and tasted precum for the first time. That was it, I wanted more. I inhaled his cock and sucked like crazy. He didn't last long, maybe two minutes, and he announced that he was going to cum. I kept sucking. With more urgency he told me to stop sucking or he was going to cum in my mouth. I kept sucking. Seconds later he gushed the most delicious thing I had ever tasted into my moth and all over my tongue. I kept sucking until he finished cumming and got every drop. As I pulled off of his cock I realized that he had no idea that I wanted to eat his cum and made a show of going to the bathroom to spit. In reality I swallowed every drop and savored the deliciousness of it.
When I returned to his room he offered to suck mine and I let him. He was really hesitant. When I said I was going to cum he pulled away and I came on my stomach. After that we discussed it and he told me that he didn't like doing it to me and I told him that I liked doing it a lot. The next time that we spent time together was at my house. I ended up sucking him off and since there was no bathroom for me to fake spitting I swallowed. He was shocked that I ate his cum. Then I admitted that I had eaten his load the first time I sucked him off and admitted that I really liked the taste and liked eating it. After that there were a few times where we would jack off together and after he came he would scoop up the cum on his fingers and feed it to me. He even developed a thing where he pinched his cock head closed and orgasmed trapping his cum in his cock and then would slowly let the cum run out onto his stomach and let me lick it up as it flowed out.
Over the next few years I sucked him off just about every time we were together. He would occasionally try sucking me, but clearly didn't like doing it. On one occasion he sucked me first and let me cum in his mouth but quickly spit it out. After a few times of him trying but clearly not liking doing it I let him off of the hook by telling him that I was fine with just me sucking him off. During our teen years he would go on dates with girls and if they didn't let him fuck them he would call me to meet him and suck him off to releive the need to cum. Those were always big, creamy loads.
After that I sucked him on a very regular basis right up until our early 20's when we got married and I moved away. When I moved back about 10 years later we picked up right where we left off with him stopping by my house on his way to work to get sucked off 2 or 3 times a week. The pic below is of me sucking him off when we were in our mid 30's.