Wounds on the inside of the ass don't breathe anyway, do they? And semen isn't dangerous, it's organic. And the natural movement of the bowels will clean the oil right out of there. I think their fictional behinds will be okay unless they keep doing it on a regular basis. For one quick garage hump, it should be fine.
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Nene and Angél sez: Just one quick hump, yeah, yeah!
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