My most memorable BJ was actually my first one, from 50 or so years ago. I started dating a girl while we both were still living at home and going to school. We'd been pawing at each other at every opportunity. The first available Saturday, we went to the drive-in, where we barely watched the film, instead practicing tongue gymnastics and a bit of touchy-feely over our clothes. The first movie ended and we eased out of the drive-in and went parking in the desert. In the front seat of the large American car (a wonderful early 1970s Chevrolet Impala) we really got into it. I had her tits out and fondling them and reaching down to suck on the closest one. She had my pants open and stroking my cock when she bent over and took me right into her mouth. God, it felt good- wet and warm and soft with her tongue brushing my head and shaft.
Jeeeezez I thought I'd blow right then. But I held on and pulled her up off my cock before it was too late. We then got our pants off and I laid back on the bench seat. She climbed on top and guided my cock to the warm and slippery entrance. It felt great sliding into her wet warmth. She rocked on me as I held her hips and made her grind her pelvis against mine. In a few minutes she sat straight up and groaned out her orgasm as I continued to push my cock up into her hot pussy. We caught our breath. We were flying without a net (no protection) and so I did not let myself cum in her. From then on the car was known as the Chevy Impaler
Got ourselves sorted out and I took her home. Didn't see her for a few days. Then one afternoon we were both free, so she came by my house and up to my room.
She seemed like she was on a mission that day. We couldn't really get into it then, as I had family home as well. But I sucked her titties and with some guidance fingered her to a quiet orgasm. After she caught her breath, she sat back "Indian style" and pulled me to her. I got up on my knees and once again she got my cock out. It was rock hard and definitely leaking and again she leaned over and took me right in. She was fairly new to cocksucking so she swirled her tongue around the head and shaft and took my length in as best she could at the time. After a warning or two about teeth (guys know what I mean), she settled into a beautiful rhythm, bobbing up and down and swirling her tongue all around my cock head. She swabbed the underside as she drove her hot and wet mouth up and down.
Pretty quickly I felt the buzz begin and knew it would build up fast. I reached down to grasp her head and said, "I'm about to cum" and tried to pull away. She was having none of that and slapped my hands away then immediately took me deeper and faster, then reached around to grab my ass to pull me closer. It was only another 30 seconds or so when I groaned "I'm cumming" and a moment later started blasting my load into her ready mouth. The first squirt caught her by surprise, but she recovered and took shot after shot as I groaned out my orgasm. Still panting, I felt her slowly release my cock and watched as she wiped her mouth. I leaned over and kissed her hard. I could taste a little of my cum on her mouth. When I was finally able to calm down and breathe normally, I put my cock away. That was the first of many and she swallowed every load.
The next most memorable was getting deepthroated the first time. I've had some world-class blowjobs over time (and a few really rotten ones) but that first one has stayed with me for all these decades.