Anilingus is the "scientific" term for applying ones mouth to another ones asshole. Then plunging ones tongue deep within the anal cavity, and swirling it 'round; giving one's partner sexual pleasure.
We're not sure who asked for it, but Brian gave Dana anilingus.
Brian: "Okay, I'm plunging my tongue in now!"
Dana: "OH! Feels good mannnnn!"
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