I'd had several oral experiences before and during college and, while in college, had a few opportunities to top. I wasn't out so all play was on the DL. After graduating college, I moved to a midsize city and discovered gay.com. This was the best way to meet people back in the mid 2000s. Fairly quickly I developed a handful of regular chat buddies and soon made plans to meet a guy. I was 24 and he was late 30s. He was very closeted and really masculine - a guy's guy. He was about my height - 5'10" - but well-built, short cropped hair, and a nice hairy chest with a 7" cock. Like me, he was a top but we enjoyed drinking beers together, watching movies, the evening would usually end up in swapping head or jerking off together. Our relationship evolved over the course of several months and we'd chat almost daily - he was like a big brother/confidant/and sexual mentor all in one. We'd chat about other hooks up we might have, dates we went on, etc but would still hang out once a week in person.
He always gave me a hard time about being a top when he knew that I'd never before bottomed. One Friday night I hung out at his place, we had a few drinks, and he told me that I could crash if I wanted. This was a big step and the first time we'd ever discussed spending the night. We had a few more drinks and around midnight we went to bed. We started fooling around and I said to him "Tim - can I bottom for you for the first time?". Being a smartass, he started laughing and said "I thought you'd never ask". It was the most perfect experience imaginable. He was gentle and told me step by step what he was going to do - kissing, sucking, fingering to loosen me up. It was an incredible experience. We'd both just gotten HIV tests so I told him I wanted to feel him without a condom. It hurt a little but was also such a good, foreign feeling. He told me he was getting close and I clutched him in my legs and told him that I wanted it inside me. Hearing him orgasm and feeling his load inside me caused me to shoot a huge load that hit me in the eye - his orgasm caused mine (no hands!). We cleaned up and I spent the night in his arms.
Despite being a country boy from Northern Indiana, he was a total gentleman and made me breakfast the next morning and asked me how I felt about it. I let him know that I was still a top but that it was an incredible experience. That was the only he ever fucked me and our relationship never changed. He continued to be my "big brother" with benefits and I was heartbroken about 18 months later when he told me he was in a relationship and we could no longer play. Nonetheless, I'll never forget this awesome experience.