It sounds like the scene is loading a clothing preset to make the cum clothing appear. That may not be the best way to make it appear at the right moment. A better way is to load all the clothing on scene load, but keep the cum clothing hidden until it's needed. You do that by setting the Alpha value on the cum to -1, and saving the scene. When there's a cumshot, a trigger can set the Alpha back to its default value, which may be 0, or slightly negative.