Setting up a Slip-n-Slide before you partner's anus, preparing yourself to run at the beginning of the slide and putting your upper body into a "whipping" position. Gain speed and run or "slip" down the slide, fully entering the other's ass (with or without lube) until you meet an end with your fist. In order to perform the "naenae" in impregenaenaetion, upon pulling out you must ejaculate on the other arm not used to whip into your partner's ass and do a second run down the slide into the partner's vaginal entrance with the opposite arm, completing the act and impregnaeting your significant other.
by Joe Frosty February 26, 2018
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