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So, all "The Pledge" is is a form of sexual transmutation used to alter the alter the outcome of unobserved events. Given that it's basically a secular form of Taoist sex magic, there are a few conclusions we can draw.
First, edging is better than just abstaining from fapping, as it builds up your overall jing (similar to chi). You want to spend as long as you can in that edged state without cumming, as the rate of jing generation is that state is over 100x normal. The more jing you have, the more likely it is your cognition coerces an indeterminate event to return your desired outcome, i.e., in this case, pulling Nessa.
But you must be careful never to accidentally go over the threshold and actually cum. That will waste all your built up jing and can cause your transmutation to have the opposite effects. The only way to salvage your jing is to eat your cum, yes, it sounds gross but it actually lets you reabsorb your jing and make up for some lost progress.
I've used this technique to successfully 5/5 SS Elesa and SS Cynthia in what I assume is a record low number of gems, so I'm pretty certain you can use it for Nessa as well. If you guys have any questions about the technique, I would be happy to answer them.