Due to a very tight and exhaustive work schedule I hadn't experienced any sexual stimulation for probably about a week. One morning rushing through breakfast I happened to be also sexting with someone online (I know, such multitasking!) with the result of my boner struggling through my pants with every movement I made. Not wanting to be late I hoped on the bike regardless of the situation in my pants and rushed to work. During the whole ride I could feel my pants rubbing all over my erection in the background but my mind was all set on work already. By the time I got to my workplace the erection was gone and nothing special so far! However, after my first round of work, when I went to the bathroom for a brake I discovered the thickest load I had ever produced in my foreskin and underwear! I was stunned and puzzled before I figured out what had happened. Weirdly I didn't even orgasm (or at least I couldn't remember). It was like an ejaculation without an orgasm. Ever since I've been desperate to relive or reproduce something similar but haven't been able to so far.
Edit: wording and formatting.