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I'm taking that you're probably new to this, so basically creampies in sex is someone being filled to the brim with sperm. So much so that it looks like cream when a penis (or dildo) pulls out and oozes from an orifice (usually from the vagina or anus, but creampies can happen to every part of the body).

All that fucking and not even one cream pie? You can tell this was written by a man.