You can load a scene with the cum clothing applied, but the Alpha value set to -1 (invisible). You can add a trigger under Actions that sets the Alpha value back to its default. If there's a cumshot pose in BL, then this is easily done in the Actions tab in PoseMe. When the cumshot pose is entered, it sets the Alpha to default. You can also have it go back to -1 on pose exit if you want an automatic cleanup. This is faster than using clothing presets. The first time a clothing preset is called, there's a lag.