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Closed Circuit 

When a consenting adult human with a penis double fists anally and vaginally a consenting adult human with a vagina while the fistee blows the fister. i.e 69ing but with consensual double fisting ;)
Trenton: Did you hear that Tammy and I completed a closed circuit last night?

Jake: Really?? You got both fists in there? Wow man I’m impressed.

Trenton: It took a lot of prep but it was worth it at the end, all out of lube though…

Closed Circuit 

A group of guys with their penises in each other's assholes in such a way that the last man's penis is in the first man's asshole, creating a ring.
Guy 1: Hey man me and some friends are getting together this weekend for a closed circuit. You in?
Guy 2: Yeah man I'm free on Sunday!
Closed Circuit by Tanzania fire ant November 20, 2015

closed circuit slut 

Closed circuit slut;
Someone who fucks a handful of people exclusively but haves their own place/independence.
She's been fucking the same 7 guys exclusively since middleschool, talk about a closed circuit slut.