Put on a Condom
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Sheath that cock! Just think about stroking through the latex and pumping a gooey load into it. Now image that load sliding down your throat... Mmmm...the anticipation...
You demand your slave sheath their cock in a condom to smother it and contain their cum. They should enjoy stroking through the latex the rest of the tease. If you let them cum at some point, be sure they do so in the condom and then guzzle their fresh load!