Let’s say… you blow that load. I can’t imagine your new friend will be shocked. Blowing loads, after all, is what men do* with their penises**, WOOD, and most people who are attracted to men are aware of this fact. And anyone who’s slept with two or more men is aware that some men blow bigger loads than others. Volume varies. Volumes vary between men, and the volume of an individual man’s loads can vary naturally or as the direct result of an intentional intervention, like edging.
Backing up for a second: Edging entails bringing yourself or being brought to the edge of coming over and over again. It’s about getting yourself or someone else as close as you can to the “point of orgasmic inevitability” without going over. Draw out the buildup to a single orgasm for hours or days — by edging yourself or being edged by someone else — and the resulting load will be larger than normal for the edged individual. But even so, an edged dude’s load can still be smaller than the load of a guy who just naturally produces more ejaculate.
And in answer to your question, WOOD, no, I don’t think there’s a pressing need to disclose your kink to your date. If it gets sexual, she’s going to expect you to produce ejaculate at some point. And even if the load you wind up blowing is enormous, you’re not going to drown her or wash out her IUD.
Frankly, WOOD, your letter reads like you got baked out of your mind and sat up half the night trying to come up with an excuse to tell this woman about your not-that-kinky kink and “I should tell her as a courtesy” was the best you could do.
If you want to tell her, go ahead and tell her. But since there’s no need to tell her that you sometimes like to stroke for a bit without climaxing, there’s a strong chance she’ll react negatively to your “courtesy” disclosure. Even if she’s made it clear there could be “a physical aspect in whatever potential relationship may ensue” — even if that’s not just dickful thinking on your part — she’s going to be scrutinizing you for signs that you aren’t someone she wants to get naked with. She’ll be looking for red flags at your first face-to-face meeting, and if you come across like a creep with piss-poor judgment — and a needless conversation about how much ejaculate you produce and why you produce so much ejaculate will definitely come across as creepy — then she may decide not to ensue with you.
* Not all men have penises, not all penises have men, not all men blow loads, not all loads are blown by men, etc.
** Not the only thing men do with their penises, some men don’t do that thing with their penises, some penis-havers don’t do that thing as men, etc.