I've done this sort of thing many times since then, but this story recounts my first experience of this kind.
It's something you hear very often among men. When I'm really horny, I often have an intense desire to eat my own cum. It always seems at the time as if it would make for the most erotic ending possible. Unfortunately, the desire usually vanishes quickly once I actually have some cum to eat. Not always. Sometimes I do taste a little finger-full. Other times I've cum into a glass and drunk the stuff soon after I've finished. And when I was younger, and could actually get my cock near enough to my face to lick the tip, I would occasionally cum into my mouth. But while all of those experiences were pleasurable enough, wouldn't it really be nice to be able to drink my cum while I was still horny and still had that intense desire?