I was either 14 or just turned 15. He was 16-17 ish.
At the time I was fully aware that my previous 3 experiences had been with other girls but something about him caught my interest. A flirtation with his brother had led to a friendship between us... This friendship eventually turned to a flirtation between us and the flirtation with the younger brother evolved to a friendship.
I'd stopped over to watch a movie with them both and when the younger brother made a trip to the store I found myself taken by the hand... Into his room. We kissed, there were roaming hands, and then there was nothing between my finger tips and his cock.
He was so hard, and so big... I wanted to see his cock so I pulled his jeans down... His boxers followed. I'd never seen such an impressive sight. I leaned down and swirled my tough over the tip. I could taste him. This sexy blend of soap and pre-cum.
His gasp stopped me... Until he urged me on and coaxed me through it. He give gentle direction, caressed my cheek, gently ran his fingers through my hair, thrusting into my mouth... When he came in my mouth I felt my own orgasm spill through me. It was incredibly intense and afterward he looked at me with a look of awe. He told me "you may have started slow but oh my god you finished me with a bang".
That was my first blow job, and the only male I interacted with for about a year. Girls? That's an entirely different story.