sewer systems aren’t air tight either - they need to let gasses escape, so i think even without an airtight seal if we consider a sewer in general a pipe system of this category it’s fair to consider the connection between butt and toilet also part of this system
many people have a special wireless connection, which explains the sewage that spews from their mouth
While two people, sitting on toilets interconnected by sewer pipes, form a long tube from one mouth to another.
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sewer systems aren’t air tight either - they need to let gasses escape, so i think even without an airtight seal if we consider a sewer in general a pipe system of this category it’s fair to consider the connection between butt and toilet also part of this system
many people have a special wireless connection, which explains the sewage that spews from their mouth